500 Internal Server Error

The server encountered an unexpected condition which prevented it from fulfilling the request.

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/cherrypy/_cprequest.py", line 551, in respond
    cherrypy.response.body = self.handler()
  File "/usr/lib/python2.4/site-packages/cherrypy/_cpdispatch.py", line 24, in __call__
    return self.callable(*self.args, **self.kwargs)
  File "./root.py", line 123, in takeupload
    p = subprocess.Popen([current_dir + '/rtorrent_fast_resume.pl', config['downloads']],stdin=open('/tmp/' + name + '.torrent', 'r'),stdout=open(config['torrents'] + 'td.' + name + '.torrent', 'w'))
  File "/usr/lib/python2.4/subprocess.py", line 542, in __init__
    errread, errwrite)
  File "/usr/lib/python2.4/subprocess.py", line 975, in _execute_child
    raise child_exception
OSError: [Errno 13] Permission denied