Hello,
I connected my A7RIII to a raspberry pi's USB port. The camera's usb mode is 
set to Auto (Mass Storage displayed on the camera.).The usb port number was 
found by using the command --auto-detect, which is usb:001,050.When running the 
command --port usb:001,050 --list-files, an error occurred:
*** Error ***              PTP General Error
*** Error ***              An error occurred in the io-library ('Unspecified 
error'): The supplied vendor or product id (0x0,0x0) is not valid.*** Error 
(-1: 'Unspecified error') ***  
As total four cameras will be connected to a Pi, I need to use the usb port 
number to distinguish them. What should I do to fix this problem?The log file 
is attached.
Thank you,Michael
0.000532 main                        (2): ALWAYS INCLUDE THE FOLLOWING LINES 
WHEN SENDING DEBUG MESSAGES TO THE MAILING LIST:
0.000739 main                        (2): gphoto2 2.5.28.1
0.000787 main                        (2): gphoto2 has been compiled with the 
following options:
0.000825 main                        (2):  + gcc (C compiler used)
0.000861 main                        (2):  + popt (mandatory, for handling 
command-line parameters)
0.000896 main                        (2):  + exif (for displaying EXIF 
information)
0.000930 main                        (2):  + no cdk (for accessing 
configuration options)
0.000964 main                        (2):  + no aa (for displaying live 
previews)
0.000998 main                        (2):  + no jpeg (for displaying live 
previews in JPEG format)
0.001032 main                        (2):  + no readline (for easy navigation 
in the shell)
0.001072 main                        (2): libgphoto2 2.5.29
0.001113 main                        (2): libgphoto2 has been compiled with the 
following options:
0.001154 main                        (2):  + standard camlib set SKIPPING SOME 
(ax203 canon digigr8 dimagev directory jl2005a jl2005c kodak_dc240 mars pentax 
ptp2 ricoh_g3 sierra sonix sq905 st2205 topfield tp6801 SKIPPING docupen lumix)
0.001189 main                        (2):  + gcc (C compiler used)
0.001223 main                        (2):  + no ltdl (for portable loading of 
camlibs)
0.001257 main                        (2):  + EXIF (for special handling of EXIF 
files)
0.001296 main                        (2): libgphoto2_port 0.12.0
0.001337 main                        (2): libgphoto2_port has been compiled 
with the following options:
0.001373 main                        (2):  + iolibs: disk ptpip serial usb1 
usbdiskdirect usbscsi
0.001407 main                        (2):  + gcc (C compiler used)
0.001445 main                        (2):  + no ltdl (for portable loading of 
iolibs)
0.001479 main                        (2):  + EXIF (for vusb)
0.001513 main                        (2):  + USB (libusb1, for USB cameras)
0.001547 main                        (2):  + serial (for serial cameras)
0.001581 main                        (2):  + no resmgr (serial port access and 
locking)
0.001615 main                        (2):  + no ttylock (serial port locking)
0.001649 main                        (2):  + no lockdev (serial port locking)
0.001684 main                        (2): CAMLIBS env var not set, using 
compile-time default instead
0.001718 main                        (2): IOLIBS env var not set, using 
compile-time default instead
0.001752 main                        (2): invoked with following arguments:
0.001786 main                        (2):   --debug
0.001820 main                        (2):   --debug-logfile=my-logfile.txt
0.001854 main                        (2):   --port
0.001887 main                        (2):   usb:001,050
0.001920 main                        (2):   --list-files
0.002023 main                        (2): Processing 'port' option 
('usb:001,050')...
0.002084 gp_port_info_list_load      (2): Using ltdl to load io-drivers from 
'/usr/local/lib/libgphoto2_port/0.12.0'...
0.002501 foreach_func                (2): Called for filename 
'/usr/local/lib/libgphoto2_port/0.12.0/disk'.
0.003421 gp_port_library_list        (2): found fstab fsname proc
0.003486 gp_port_library_list        (2): found fstab fsname 
PARTUUID=3419d416-01
0.003577 gp_port_library_list        (2): found fstab fsname 
PARTUUID=3419d416-02
0.003895 gp_port_library_list        (2): found mtab fsname /dev/root
0.003966 gp_port_library_list        (2): found mtab fsname devtmpfs
0.004017 gp_port_library_list        (2): found mtab fsname proc
0.004063 gp_port_library_list        (2): found mtab fsname sysfs
0.004113 gp_port_library_list        (2): found mtab fsname securityfs
0.004162 gp_port_library_list        (2): found mtab fsname tmpfs
0.004257 gp_port_library_list        (2): found mtab fsname devpts
0.004307 gp_port_library_list        (2): found mtab fsname tmpfs
0.004398 gp_port_library_list        (2): found mtab fsname tmpfs
0.004546 gp_port_library_list        (2): found mtab fsname cgroup2
0.004595 gp_port_library_list        (2): found mtab fsname bpf
0.004680 gp_port_library_list        (2): found mtab fsname systemd-1
0.004728 gp_port_library_list        (2): found mtab fsname mqueue
0.004772 gp_port_library_list        (2): found mtab fsname sunrpc
0.004865 gp_port_library_list        (2): found mtab fsname debugfs
0.005035 gp_port_library_list        (2): found mtab fsname tracefs
0.005120 gp_port_library_list        (2): found mtab fsname nfsd
0.005167 gp_port_library_list        (2): found mtab fsname configfs
0.005272 gp_port_library_list        (2): found mtab fsname fusectl
0.005321 gp_port_library_list        (2): found mtab fsname /dev/mmcblk0p1
0.005395 gp_port_library_list        (2): found mtab fsname tmpfs
0.005490 gp_port_library_list        (2): found mtab fsname gvfsd-fuse
0.005539 gp_port_library_list        (2): found mtab fsname /dev/sdb1
0.005853 gp_port_info_list_lookup_path(2): Looking for path 
'disk:/media/pi/3232-3964' (0 entries available)...
0.005892 gp_port_info_list_lookup_path(2): Starting regex search for 
'disk:/media/pi/3232-3964'...
0.006079 foreach_func                (2): Loaded 'Media '/dev/sdb1'' 
('disk:/media/pi/3232-3964') from '/usr/local/lib/libgphoto2_port/0.12.0/disk'.
0.006123 foreach_func                (2): Loaded '' ('^disk:') from 
'/usr/local/lib/libgphoto2_port/0.12.0/disk'.
0.006160 foreach_func                (2): Called for filename 
'/usr/local/lib/libgphoto2_port/0.12.0/ptpip'.
0.006827 foreach_func                (2): Loaded 'PTP/IP Connection' ('ptpip:') 
from '/usr/local/lib/libgphoto2_port/0.12.0/ptpip'.
0.006874 foreach_func                (2): Loaded '' ('^ptpip:') from 
'/usr/local/lib/libgphoto2_port/0.12.0/ptpip'.
0.006912 foreach_func                (2): Loaded 'IP Connection' ('ip:') from 
'/usr/local/lib/libgphoto2_port/0.12.0/ptpip'.
0.006950 foreach_func                (2): Loaded '' ('^ip:') from 
'/usr/local/lib/libgphoto2_port/0.12.0/ptpip'.
0.006986 foreach_func                (2): Called for filename 
'/usr/local/lib/libgphoto2_port/0.12.0/serial'.
0.008243 foreach_func                (2): Loaded 'Serial Port Device' 
('serial:') from '/usr/local/lib/libgphoto2_port/0.12.0/serial'.
0.008289 foreach_func                (2): Loaded '' ('^serial:') from 
'/usr/local/lib/libgphoto2_port/0.12.0/serial'.
0.008324 foreach_func                (2): Called for filename 
'/usr/local/lib/libgphoto2_port/0.12.0/usb1'.
0.028378 foreach_func                (2): Loaded '' ('^usb:') from 
'/usr/local/lib/libgphoto2_port/0.12.0/usb1'.
0.028473 foreach_func                (2): Loaded 'Universal Serial Bus' 
('usb:001,050') from '/usr/local/lib/libgphoto2_port/0.12.0/usb1'.
0.028513 foreach_func                (2): Called for filename 
'/usr/local/lib/libgphoto2_port/0.12.0/usbdiskdirect'.
0.029759 foreach_func                (2): Loaded 'USB Mass Storage direct IO' 
('usbdiskdirect:/dev/sdb') from 
'/usr/local/lib/libgphoto2_port/0.12.0/usbdiskdirect'.
0.029827 foreach_func                (2): Called for filename 
'/usr/local/lib/libgphoto2_port/0.12.0/usbscsi'.
0.031080 foreach_func                (2): Loaded 'USB Mass Storage raw SCSI' 
('usbscsi:/dev/sg0') from '/usr/local/lib/libgphoto2_port/0.12.0/usbscsi'.
0.031129 foreach_func                (2): Called for filename 
'/usr/local/lib/libgphoto2_port/0.12.0/vusb'.
0.031650 gp_port_library_type        (2): ()
0.031696 foreach_func                (2): 
'/usr/local/lib/libgphoto2_port/0.12.0/vusb' already loaded
0.031875 gp_port_info_list_count     (2): Counting entries (12 available)...
0.031916 gp_port_info_list_count     (2): 7 regular entries available.
0.031957 gp_port_info_list_lookup_path(2): Looking for path 'usb:001,050' (12 
entries available)...
0.032002 gp_port_info_list_get_info  (2): Getting info of entry 4 (12 
available)...
0.032053 gp_camera_set_port_info     (2): Setting port info for port 'Universal 
Serial Bus' at 'usb:001,050'...
0.050700 gp_port_set_timeout         (2): Setting port timeout to 5000 
milliseconds.
0.050850 gp_port_set_settings        (2): Setting settings...
0.050904 gp_libusb1_update           (2): (old int=0, conf=-1, alt=-1) port 
usb:001,050, (new int=0, conf=-1, alt=-1) port usb:001,050
0.050941 gp_libusb1_update           (2): lowlevel libusb1 port not yet opened, 
no need for libusb changes
0.050998 load_settings               (2): Creating gphoto config directory 
('/home/pi/.gphoto')
0.051209 load_settings               (2): Loading settings from file 
'/home/pi/.gphoto/settings'.
0.051335 gp_setting_set              (2): Setting key 'port' to value 
'usb:001,050' (gphoto2)
0.051383 save_settings               (2): Saving 3 setting(s) to file 
"/home/pi/.gphoto/settings"
0.052794 main                        (2): The user has not specified both a 
model and a port. Try to figure them out.
0.052899 gp_abilities_list_load_dir  (2): Using ltdl to load camera libraries 
from '/usr/local/lib/libgphoto2/2.5.29'...
0.053438 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/ax203'.
0.053491 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/canon'.
0.053529 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/digigr8'.
0.053564 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/dimagev'.
0.053599 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/directory'.
0.053634 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/jl2005a'.
0.053669 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/jl2005c'.
0.053703 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/kodak_dc240'.
0.053739 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/mars'.
0.053774 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/pentax'.
0.053810 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/ptp2'.
0.053846 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/ricoh_g3'.
0.053882 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/sierra'.
0.053917 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/sonix'.
0.053954 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/sq905'.
0.053989 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/st2205'.
0.054025 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/topfield'.
0.054061 foreach_func                (2): Found 
'/usr/local/lib/libgphoto2/2.5.29/tp6801'.
0.054104 gp_abilities_list_load_dir  (2): Found 18 camera drivers.
0.120431 gp_port_info_list_count     (2): Counting entries (12 available)...
0.120518 gp_port_info_list_count     (2): 7 regular entries available.
0.120531 gp_port_new                 (2): Creating new device...
0.120557 gp_port_info_list_get_info  (2): Getting info of entry 0 (12 
available)...
0.120925 gp_port_set_settings        (2): Setting settings...
0.120964 gp_port_set_error [gphoto2-port.c:1177](0): The operation 'update' is 
not supported by this device
0.121003 gp_port_info_list_get_info  (2): Getting info of entry 1 (12 
available)...
0.121220 gp_port_set_settings        (2): Setting settings...
0.121238 gp_port_info_list_get_info  (2): Getting info of entry 2 (12 
available)...
0.121422 gp_port_set_settings        (2): Setting settings...
0.121437 gp_port_info_list_get_info  (2): Getting info of entry 3 (12 
available)...
0.121646 gp_port_set_timeout         (2): Setting port timeout to 500 
milliseconds.
0.121661 gp_port_set_settings        (2): Setting settings...
0.121676 gp_port_info_list_get_info  (2): Getting info of entry 4 (12 
available)...
0.127455 gp_port_set_timeout         (2): Setting port timeout to 5000 
milliseconds.
0.127486 gp_port_set_settings        (2): Setting settings...
0.127503 gp_libusb1_update           (2): (old int=0, conf=-1, alt=-1) port 
usb:001,050, (new int=0, conf=-1, alt=-1) port usb:001,050
0.127516 gp_libusb1_update           (2): lowlevel libusb1 port not yet opened, 
no need for libusb changes
0.127558 gp_abilities_list_detect_usb(2): Auto-detecting USB cameras...
0.129756 gp_libusb1_find_device_by_class_lib(2): Looking for USB device (class 
0x29a, subclass, 0xffffffff, protocol 0xffffffff)...
0.131335 gp_libusb1_find_device_by_class_lib(2): Looking for USB device (class 
0x6, subclass, 0x1, protocol 0x1)...
0.131365 gp_libusb1_find_device_by_class_lib(2): Found USB class device (class 
0x6, subclass, 0x1, protocol 0x1)
0.131383 gp_libusb1_find_device_by_class_lib(2): inep to look for is 81
0.131399 gp_libusb1_find_device_by_class_lib(2): Detected defaults: config 2, 
interface 0, altsetting 0, idVendor ID 054c, idProduct 0d98, inep 81, outep 02, 
intep 83
0.131412 gp_abilities_list_detect_usb(2): Found 'USB PTP Class Camera' 
(0x6,0x1,0x1)
0.131426 gp_port_info_list_get_info  (2): Getting info of entry 5 (12 
available)...
0.131813 gp_port_set_settings        (2): Setting settings...
0.131836 gp_abilities_list_detect_usb(2): Auto-detecting USB cameras...
0.132057 gp_port_info_list_get_info  (2): Getting info of entry 6 (12 
available)...
0.132318 gp_port_set_settings        (2): Setting settings...
0.132336 gp_abilities_list_detect_usb(2): Auto-detecting USB cameras...
0.136396 gp_port_free                (2): Freeing port...
0.136419 gp_port_close               (2): Closing port...
0.136486 gphoto2                     (2): Looking for port ...

0.136501 gphoto2                     (2): info.type = 4

0.136512 gphoto2                     (2): info.name = Universal Serial Bus

0.136523 gphoto2                     (2): info.path = usb:001,050

0.136749 gp_camera_set_abilities     (2): Setting abilities ('USB PTP Class 
Camera')...
0.136767 gp_setting_set              (2): Setting key 'model' to value 'USB PTP 
Class Camera' (gphoto2)
0.136782 save_settings               (2): Saving 3 setting(s) to file 
"/home/pi/.gphoto/settings"
0.137098 gp_port_info_list_lookup_path(2): Looking for path 'usb:001,050' (12 
entries available)...
0.137117 gp_port_info_list_get_info  (2): Getting info of entry 4 (12 
available)...
0.137131 gp_camera_set_port_info     (2): Setting port info for port 'Universal 
Serial Bus' at 'usb:001,050'...
0.144197 gp_port_set_timeout         (2): Setting port timeout to 5000 
milliseconds.
0.144235 gp_port_set_settings        (2): Setting settings...
0.144255 gp_libusb1_update           (2): (old int=0, conf=-1, alt=-1) port 
usb:001,050, (new int=0, conf=-1, alt=-1) port usb:001,050
0.144268 gp_libusb1_update           (2): lowlevel libusb1 port not yet opened, 
no need for libusb changes
0.144282 gp_setting_set              (2): Setting key 'port' to value 
'usb:001,050' (gphoto2)
0.144298 save_settings               (2): Saving 3 setting(s) to file 
"/home/pi/.gphoto/settings"
0.144609 gphoto2                     (2): found port, was entry 1

0.144687 foreach                     (2): Executing action 'List Files' for 
folder '/'.
0.144704 gp_camera_folder_list_files (2): Listing files in '/'...
0.144719 gp_camera_init              (2): Initializing camera...
0.144758 gp_port_set_error [gphoto2-port.c:1177](0): The supplied vendor or 
product id (0x0,0x0) is not valid.
0.144805 gp_libusb1_find_device_by_class_lib(2): Looking for USB device (class 
0x6, subclass, 0x1, protocol 0x1)...
0.144829 gp_libusb1_find_device_by_class_lib(2): Found USB class device (class 
0x6, subclass, 0x1, protocol 0x1)
0.144847 gp_libusb1_find_device_by_class_lib(2): inep to look for is 81
0.144863 gp_libusb1_find_device_by_class_lib(2): Detected defaults: config 2, 
interface 0, altsetting 0, idVendor ID 054c, idProduct 0d98, inep 81, outep 02, 
intep 83
0.144875 gp_camera_init              (2): Loading 
'/usr/local/lib/libgphoto2/2.5.29/ptp2'...
0.145598 gp_port_open                (2): Opening USB port...
0.145625 gp_libusb1_open             (2): ()
0.145695 gp_libusb1_open             (2): Device has a kernel driver attached 
(1), detaching it now.
0.300586 gp_libusb1_open             (2): claiming interface 0
0.300992 camera_init                 (2): maxpacketsize 512
0.301041 gp_port_set_timeout         (2): Setting port timeout to 8000 
milliseconds.
0.301104 ptp                         (2): PTP: Opening session
0.301200 ptp_usb_sendreq             (2): Sending PTP_OC 0x1002 (Open session) 
(0x1) request...
0.301216 gp_port_write               (3): Writing 16 = 0x10 bytes to port...
0.304636 gp_port_write               (3): Wrote   16 = 0x10 bytes to port: 
(hexdump of 16 bytes)
0000  10 00 00 00 01 00 02 10-00 00 00 00 01 00 00 00  ................

0.304702 ptp_usb_getresp             (2): Reading PTP_OC 0x1002 (Open session) 
response...
0.304721 gp_port_read                (3): Reading 1024 = 0x400 bytes from 
port...
0.305064 gp_libusb1_read [libusb1.c:592](0): 'libusb_bulk_transfer 
(port->pl->dh, port->settings.usb.inep, (unsigned char*)bytes, size, &curread, 
port->timeout)' failed: Pipe error (-9)
0.305092 gp_port_read [gphoto2-port.c:427](0): Reading 1024 = 0x400 bytes from 
port failed: Error reading from the port (-34)
0.305104 ptp_usb_getpacket           (2): Clearing halt on IN EP and retrying 
once.
0.305118 gp_port_usb_clear_halt      (2): Clear USB halt...
0.305276 gp_port_read                (3): Reading 1024 = 0x400 bytes from 
port...
0.305572 gp_libusb1_read [libusb1.c:592](0): 'libusb_bulk_transfer 
(port->pl->dh, port->settings.usb.inep, (unsigned char*)bytes, size, &curread, 
port->timeout)' failed: Pipe error (-9)
0.305600 gp_port_read [gphoto2-port.c:427](0): Reading 1024 = 0x400 bytes from 
port failed: Error reading from the port (-34)
0.305612 ptp_usb_getpacket           (2): Clearing halt on IN EP and retrying 
once.
0.305623 gp_port_usb_clear_halt      (2): Clear USB halt...
0.305834 ptp_usb_getresp [usb.c:516] (0): PTP_OC 0x1002 receiving resp failed: 
PTP I/O Error (0x02ff)
0.305855 camera_init [library.c:9674](0): 'ptp_opensession (params, sessionid)' 
failed: PTP I/O Error (0x02ff)
0.305867 ptp_usb_control_device_reset_request(2): Sending usb device reset 
request.
0.305885 gp_port_usb_msg_class_write (3): Writing message (request=0x66 
value=0x0 index=0x0 size=0=0x0): (no hexdump, NULL buffer)
0.306217 gp_libusb1_msg [libusb1.c:811](0): 'handled = libusb_control_transfer 
(port->pl->dh, flags, request, value, index, (unsigned char*)bytes, size, 
port->timeout)' failed: Pipe error (-9)
0.306237 ptp                         (2): PTP: Opening session
0.306258 ptp_usb_sendreq             (2): Sending PTP_OC 0x1002 (Open session) 
(0x1) request...
0.306272 gp_port_write               (3): Writing 16 = 0x10 bytes to port...
0.306578 gp_libusb1_write [libusb1.c:578](0): 'libusb_bulk_transfer 
(port->pl->dh, port->settings.usb.outep, (unsigned char*)bytes, size, 
&curwritten, port->timeout)' failed: Pipe error (-9)
0.306599 gp_port_write [gphoto2-port.c:392](0): Writing 16 = 0x10 bytes to port 
failed: Error writing to the port (-35)
0.306619 ptp_usb_sendreq [usb.c:109] (0): PTP_OC 0x1002 sending req failed: 
Error writing to the port (-35)
0.306631 ptp_usb_sendreq             (2): Clearing halt on OUT EP and retrying 
once.
0.306643 gp_port_usb_clear_halt      (2): Clear USB halt...
0.306799 gp_port_write               (3): Writing 16 = 0x10 bytes to port...
0.307088 gp_libusb1_write [libusb1.c:578](0): 'libusb_bulk_transfer 
(port->pl->dh, port->settings.usb.outep, (unsigned char*)bytes, size, 
&curwritten, port->timeout)' failed: Pipe error (-9)
0.307106 gp_port_write [gphoto2-port.c:392](0): Writing 16 = 0x10 bytes to port 
failed: Error writing to the port (-35)
0.307123 ptp_usb_sendreq [usb.c:109] (0): PTP_OC 0x1002 sending req failed: 
Error writing to the port (-35)
0.307138 camera_init [library.c:9674](0): 'ptp_opensession (params, sessionid)' 
failed: PTP General Error (0x2002)
0.307149 ptp                         (2): PTP: Opening session
0.307164 ptp_usb_sendreq             (2): Sending PTP_OC 0x1002 (Open session) 
(0x1) request...
0.307176 gp_port_write               (3): Writing 16 = 0x10 bytes to port...
0.307502 gp_libusb1_write [libusb1.c:578](0): 'libusb_bulk_transfer 
(port->pl->dh, port->settings.usb.outep, (unsigned char*)bytes, size, 
&curwritten, port->timeout)' failed: Pipe error (-9)
0.307520 gp_port_write [gphoto2-port.c:392](0): Writing 16 = 0x10 bytes to port 
failed: Error writing to the port (-35)
0.307565 ptp_usb_sendreq [usb.c:109] (0): PTP_OC 0x1002 sending req failed: 
Error writing to the port (-35)
0.307576 ptp_usb_sendreq             (2): Clearing halt on OUT EP and retrying 
once.
0.307588 gp_port_usb_clear_halt      (2): Clear USB halt...
0.307981 gp_port_write               (3): Writing 16 = 0x10 bytes to port...
0.308258 gp_libusb1_write [libusb1.c:578](0): 'libusb_bulk_transfer 
(port->pl->dh, port->settings.usb.outep, (unsigned char*)bytes, size, 
&curwritten, port->timeout)' failed: Pipe error (-9)
0.308276 gp_port_write [gphoto2-port.c:392](0): Writing 16 = 0x10 bytes to port 
failed: Error writing to the port (-35)
0.308292 ptp_usb_sendreq [usb.c:109] (0): PTP_OC 0x1002 sending req failed: 
Error writing to the port (-35)
0.308306 camera_init [library.c:9674](0): 'ptp_opensession (params, sessionid)' 
failed: PTP General Error (0x2002)
0.308319 camera_init [library.c:9702](0): 'ret' failed: 'PTP General Error' 
(0x2002)
0.308361 gp_context_error            (0): PTP General Error
0.308425 gp_port_close               (2): Closing port...
0.309514 _close_async_interrupts     (2): canceling transfer 0:0x1c83ff8 
(status 0)
0.309855 _close_async_interrupts     (2): canceling transfer 1:0x1c80300 
(status 0)
0.310136 _close_async_interrupts     (2): canceling transfer 2:0x1c84e48 
(status 0)
0.310423 _close_async_interrupts     (2): canceling transfer 3:0x1c77e70 
(status 0)
0.310710 _close_async_interrupts     (2): canceling transfer 4:0x1c7a600 
(status 0)
0.311000 _close_async_interrupts     (2): canceling transfer 5:0x1c77490 
(status 0)
0.311293 _close_async_interrupts     (2): canceling transfer 6:0x1c79680 
(status 0)
0.311699 _close_async_interrupts     (2): canceling transfer 7:0x1c7a4d8 
(status 0)
0.311986 _close_async_interrupts     (2): canceling transfer 8:0x1c77790 
(status 0)
0.312285 _close_async_interrupts     (2): canceling transfer 9:0x1c77820 
(status 0)
0.312710 _cb_irq                     (2): 0x1c83ff8 with status 3
0.312725 _cb_irq                     (2): Transfer 0x1c83ff8 should be in 
LIBUSB_TRANSFER_COMPLETED, but is 3!
0.312746 _cb_irq                     (2): 0x1c80300 with status 3
0.312758 _cb_irq                     (2): Transfer 0x1c80300 should be in 
LIBUSB_TRANSFER_COMPLETED, but is 3!
0.312776 _cb_irq                     (2): 0x1c84e48 with status 3
0.312788 _cb_irq                     (2): Transfer 0x1c84e48 should be in 
LIBUSB_TRANSFER_COMPLETED, but is 3!
0.312805 _cb_irq                     (2): 0x1c77e70 with status 3
0.312818 _cb_irq                     (2): Transfer 0x1c77e70 should be in 
LIBUSB_TRANSFER_COMPLETED, but is 3!
0.312835 _cb_irq                     (2): 0x1c7a600 with status 3
0.312847 _cb_irq                     (2): Transfer 0x1c7a600 should be in 
LIBUSB_TRANSFER_COMPLETED, but is 3!
0.312864 _cb_irq                     (2): 0x1c77490 with status 3
0.312877 _cb_irq                     (2): Transfer 0x1c77490 should be in 
LIBUSB_TRANSFER_COMPLETED, but is 3!
0.312894 _cb_irq                     (2): 0x1c79680 with status 3
0.312906 _cb_irq                     (2): Transfer 0x1c79680 should be in 
LIBUSB_TRANSFER_COMPLETED, but is 3!
0.312923 _cb_irq                     (2): 0x1c7a4d8 with status 3
0.312936 _cb_irq                     (2): Transfer 0x1c7a4d8 should be in 
LIBUSB_TRANSFER_COMPLETED, but is 3!
0.312954 _cb_irq                     (2): 0x1c77790 with status 3
0.312966 _cb_irq                     (2): Transfer 0x1c77790 should be in 
LIBUSB_TRANSFER_COMPLETED, but is 3!
0.312984 _cb_irq                     (2): 0x1c77820 with status 3
0.312996 _cb_irq                     (2): Transfer 0x1c77820 should be in 
LIBUSB_TRANSFER_COMPLETED, but is 3!
0.314142 gp_context_error            (0): An error occurred in the io-library 
('Unspecified error'): The supplied vendor or product id (0x0,0x0) is not valid.
0.315483 gp_camera_free              (2): Freeing camera...
0.315539 gp_port_free                (2): Freeing port...
0.315552 gp_port_close               (2): Closing port...
0.316478 gp_filesystem_reset         (2): resetting filesystem
0.316517 gp_filesystem_lru_clear     (2): Clearing fscache LRU list...
0.316528 gp_filesystem_lru_clear     (2): fscache LRU list already empty
0.316540 delete_all_folders          (2): Internally deleting all folders from 
'/'...
0.316552 lookup_folder               (2): Lookup folder '/'...
0.316564 lookup_folder               (2): Found! / is 0x1c68da0
0.316576 recurse_delete_folder       (2): Recurse delete folder 0x1c68da0//
0.316589 delete_all_files            (2): Delete all files in folder 0x1c68da0//
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