Hello,

I am experiencing problems with the tutorial on OOT development. I am
trying to implement the basic square_ff that is described here:

https://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules

and I get the following error:

  File "MYPATHTOMODULE/Gnuradio/top_block.py", line 263, in <module>
    main()
  File "MYPATHTOMODULE/Gnuradio/top_block.py", line 251, in main
    tb = top_block_cls()
  File "MYPATHTOMODULE/Gnuradio/top_block.py", line 117, in __init__
    self.howto_square2_ff_0 = howto.square2_ff()
AttributeError: 'module' object has no attribute 'square2_ff'

where "MYPATHTOMODULE" is where I have saved the files.

I have followed the instructions very carefully and the module appears in
GRC but the error is still there.

I have recently seen the same issue in these threads:

https://lists.gnu.org/archive/html/discuss-gnuradio/2015-02/msg00156.html
https://lists.gnu.org/archive/html/discuss-gnuradio/2015-02/msg00130.html
https://lists.gnu.org/archive/html/discuss-gnuradio/2015-08/msg00364.html

But in all cases people seem to have done something more other than just
the tutorial.

Here's a link to my files:
https://www.dropbox.com/sh/phd3mzi6lwrh9vl/AAASUHh8Tj6PxrLEb78zYMTRa?dl=0

I installed gnuradio using the build-gnuradio script after I fixed the
 libzmq-dev typo.

* ldd libgnuradio-howto.so *gives the following output:
linux-vdso.so.1 =>  (0x00007ffd821b1000)
libboost_system.so.1.54.0 =>
/usr/lib/x86_64-linux-gnu/libboost_system.so.1.54.0 (0x00007f3a0fcde000)
libgnuradio-runtime-3.7.9.1.so.0.0.0 =>
/usr/local/lib/libgnuradio-runtime-3.7.9.1.so.0.0.0 (0x00007f3a0fa0f000)
libgnuradio-pmt-3.7.9.1.so.0.0.0 =>
/usr/local/lib/libgnuradio-pmt-3.7.9.1.so.0.0.0 (0x00007f3a0f7c7000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6
(0x00007f3a0f4c3000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f3a0f2ad000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f3a0eee8000)
libvolk.so.1.2.1 => /usr/local/lib/libvolk.so.1.2.1 (0x00007f3a0eb2a000)
libboost_filesystem.so.1.54.0 =>
/usr/lib/x86_64-linux-gnu/libboost_filesystem.so.1.54.0 (0x00007f3a0e914000)
libboost_thread.so.1.54.0 =>
/usr/lib/x86_64-linux-gnu/libboost_thread.so.1.54.0 (0x00007f3a0e6fe000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
(0x00007f3a0e4e0000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f3a0e2d8000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f3a0dfd2000)
/lib64/ld-linux-x86-64.so.2 (0x00007f3a100ed000)
liborc-0.4.so.0 => /usr/lib/x86_64-linux-gnu/liborc-0.4.so.0
(0x00007f3a0dd50000)


The problem appeared after I upgraded from ubuntu 12.04 to ubuntu 14.04 if
that helps.
uname -a gives:
3.13.0-79-generic #123-Ubuntu SMP Fri Feb 19 14:27:58 UTC 2016 x86_64
x86_64 x86_64 GNU/Linux

I had a module that acted as a very simple detector for my receiver that
converted a complex number to a binary value (byte output) that worked fine
before the upgrade that I have developed with the same method as the
tutorial. Now of course it doesn't work.

I wouldn't send a message if I hadn't spend 3 days on this but now I am
really stuck. Please advise.


Thank you
Lefteris
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