[Twisted-web] can't load modules in nevow tutorial

[jbdunsmo at utmb.edu]

i just installed nevow and am trying to run the tutorial
(http://nevow.com/Nevow2004Tutorial.html), but i get the following
error that the modules located in the Example4 directory can't be
found:

# twistd -noy sched.tac 
2004/05/19 08:08 CDT [-] Log opened.
2004/05/19 08:08 CDT [-] twistd 1.2.0 (/usr/bin/python 2.3.3) starting up
2004/05/19 08:08 CDT [-] reactor class: twisted.internet.default.SelectReactor
2004/05/19 08:08 CDT [-] Loading sched.tac...
2004/05/19 08:08 CDT [-] Traceback (most recent call last):
2004/05/19 08:08 CDT [-]   File "/usr/lib/python2.3/site-packages/twisted/application/app.py", line 117, in getApplication
2004/05/19 08:08 CDT [-]     application = service.loadApplication(filename, style, passphrase)
2004/05/19 08:08 CDT [-]   File "/usr/lib/python2.3/site-packages/twisted/application/service.py", line 291, in loadApplication
2004/05/19 08:08 CDT [-]     application = sob.loadValueFromFile(filename, 'application', passphrase)
2004/05/19 08:08 CDT [-]   File "/usr/lib/python2.3/site-packages/twisted/persisted/sob.py", line 213, in loadValueFromFile
2004/05/19 08:08 CDT [-]     exec data in d, d
2004/05/19 08:08 CDT [-]   File "<string>", line 3, in ?
2004/05/19 08:08 CDT [-] ImportError: No module named iCal
2004/05/19 08:08 CDT [-] Failed to load application: No module named iCal
2004/05/19 08:08 CDT [-] Traceback (most recent call last):
          File "/usr/bin/twistd", line 36, in ?
            run()
          File "/usr/lib/python2.3/site-packages/twisted/scripts/twistd.py", line 188, in run
            app.run(runApp, ServerOptions)
          File "/usr/lib/python2.3/site-packages/twisted/application/app.py", line 204, in run
            runApp(config)
          File "/usr/lib/python2.3/site-packages/twisted/scripts/twistd.py", line 178, in runApp
            application = app.getApplication(config, passphrase)
        --- <exception caught here> ---
          File "/usr/lib/python2.3/site-packages/twisted/application/app.py", line 117, in getApplication
            application = service.loadApplication(filename, style, passphrase)
          File "/usr/lib/python2.3/site-packages/twisted/application/service.py", line 291, in loadApplication
            application = sob.loadValueFromFile(filename, 'application', passphrase)
          File "/usr/lib/python2.3/site-packages/twisted/persisted/sob.py", line 213, in loadValueFromFile
            exec data in d, d
          File "<string>", line 3, in ?
            
        exceptions.ImportError: No module named iCal


Failed to load application: No module named iCal
2004/05/19 08:08 CDT [-] 


when i set $PYTHONPATH to /usr/share/doc/nevow-0.1/doc/Example4 it
works fine.  what's the problem here?

thanks,
jason