[web2py] Ubuntu 11.10 Internal error Ticket issued: unrecoverable

[Halili]

I downloaded the web2py source, unzipped it. When I tried to run
web2py.py, I got  "Internal error Ticket issued: unrecoverable".

starting browser...

(firefox:4334): Gtk-WARNING **: Tema aygıtı module_path "pixmap"
içinde bulunamadı,

(firefox:4334): Gtk-WARNING **: Tema aygıtı module_path "pixmap"
içinde bulunamadı,

(firefox:4334): Gtk-WARNING **: Tema aygıtı module_path "pixmap"
içinde bulunamadı,

(firefox:4334): Gtk-WARNING **: Tema aygıtı module_path "pixmap"
içinde bulunamadı,
ERROR:web2py:Traceback (most recent call last):
  File "/home/user1/İndirilenler/web2py/gluon/main.py", line 381, in
wsgibase
    (static_file, environ) = rewrite.url_in(request, environ)
  File "/home/user1/İndirilenler/web2py/gluon/rewrite.py", line 107,
in url_in
    return regex_url_in(request, environ)
  File "/home/user1/İndirilenler/web2py/gluon/rewrite.py", line 564,
in regex_url_in
    path = request.env.path_info.replace('\\', '/')
AttributeError: 'NoneType' object has no attribute 'replace'