Python handler error returning "500 internal server error" in browser

[jdc@…]

Hi,

I was installing Trac and got this error returned:

[Fri Jul 18 11:39:14 2008] [error] [client 192.168.2.3] PythonHandler trac.web.modpython_frontend: Traceback (most recent call last):
[Fri Jul 18 11:39:14 2008] [error] [client 192.168.2.3] PythonHandler trac.web.modpython_frontend:   File "/usr/lib64/python2.4/site-packages/mod_python/apache.py", line 299, in HandlerDispatch\n    result = object(req)
[Fri Jul 18 11:39:14 2008] [error] [client 192.168.2.3] PythonHandler trac.web.modpython_frontend:   File "/usr/lib/python2.4/site-packages/Trac-0.11-py2.4.egg/trac/web/modpython_frontend.py", line 127, in handler\n    from trac.web.main import dispatch_request
[Fri Jul 18 11:39:14 2008] [error] [client 192.168.2.3] PythonHandler trac.web.modpython_frontend:   File "/usr/lib/python2.4/site-packages/Trac-0.11-py2.4.egg/trac/web/main.py", line 47, in ?\n    from trac.web.chrome import Chrome
[Fri Jul 18 11:39:14 2008] [error] [client 192.168.2.3] PythonHandler trac.web.modpython_frontend:   File "/usr/lib/python2.4/site-packages/Trac-0.11-py2.4.egg/trac/web/chrome.py", line 40, in ?\n    from trac.util import compat, get_reporter_id, presentation, get_pkginfo, \\
[Fri Jul 18 11:39:14 2008] [error] [client 192.168.2.3] PythonHandler trac.web.modpython_frontend: ImportError: cannot import name compat

This is my code in trac.conf

<Location /trac/testproject>
        SetHandler mod_python
        PythonHandler trac.web.modpython_frontend
        PythonOption TracEnv /tcs/trac/testproject
        PythonOption TracUriRoot /trac/testproject
</Location>

<Location "/trac/testproject/login">
        AuthType Basic
        AuthName "trac"
        AuthUserFile /tcs/trac/testproject.htpasswd
        Require valid-user
</Location>

Is there any more information required to solve this problem?

[cboos]

Well, you never know if that pastebin link will last for the few years to come... better include the actual error inline.

Chances are that your mod_python is still seeing some parts of an older (0.9 or 0.10) Trac installation.

Check your PYTHONPATH and check the following locations:

• /usr/lib/python2.4/site-packages/Trac-0.11-py2.4.egg/trac/util/compat.py (should be there)
• /usr/lib/python2.4/site-packages/trac (should not be there)

[anonymous]

Replying to cboos:

Well, you never know if that pastebin link will last for the few years to come... better include the actual error inline.

Chances are that your mod_python is still seeing some parts of an older (0.9 or 0.10) Trac installation.

Check your PYTHONPATH and check the following locations:

• /usr/lib/python2.4/site-packages/Trac-0.11-py2.4.egg/trac/util/compat.py (should be there)
• /usr/lib/python2.4/site-packages/trac (should not be there)

Hi, thanks for the fast response and integrating the error inline.

The install on this box is fresh so it's impossible mod_python is still seeing parts of an older installation. I have also checked PYTHONPATH and it looks okay. I checked the directories as you suggested and everything looks like it should be.

Do you know any other things that could cause this error?

Thanks,
Jasper

[cboos]

Do you know any other things that could cause this error?

No, sorry. You should better ask on the mailing list then (as for installation issues in general - hence closing the ticket).

[anonymous]

Looks like the problem solved itself... I don't receive the errors anymore and everything seems to work just fine!

[cboos]

Just noticed that related thread on Trac-users today: ​googlegroups:trac-users:f0a0ba4fc955a0a4

Not sure what the exact problem is, but seems to be related to the presence of another compat.py file (source:trunk/trac/tests/functional/compat.py​).