Mod_python error: "PythonHandler code.webhandler"

Traceback (most recent call last):

  File "/usr/lib/python2.4/site-packages/mod_python/apache.py", line 299, in HandlerDispatch
    result = object(req)

  File "/usr/lib/glasnost/web/code/webhandler.py", line 1477, in handler
    result = application.handler(req)

  File "/usr/lib/glasnost/web/code/webhandler.py", line 636, in handler
    result = self.parseHttpPath([x for x in httpLocalPath.split('/') if x])

  File "/usr/lib/glasnost/web/code/webhandler.py", line 846, in parseHttpPath
    result = self.parseHttpPathServerRole(remaining)

  File "/usr/lib/glasnost/web/code/webhandler.py", line 1212, in parseHttpPathServerRole
    result = self.parseHttpPathId(remaining)

  File "/usr/lib/glasnost/web/code/webhandler.py", line 999, in parseHttpPathId
    result = self.parseHttpPathAction(remaining)

  File "/usr/lib/glasnost/web/code/webhandler.py", line 890, in parseHttpPathAction
    result = self.parseHttpPathArguments(remaining)

  File "/usr/lib/glasnost/web/code/webhandler.py", line 946, in parseHttpPathArguments
    return self.callFunction()

  File "/usr/lib/glasnost/web/code/webhandler.py", line 152, in callFunction
    result = function(*arguments, **keywords)

  File "/usr/lib/glasnost/glasnost/web/UploadFilesWeb.py", line 297, in thumbnail
    object = self.getObjectThumbnail(id, width, height)

  File "/usr/lib/glasnost/glasnost/proxy/UploadFilesProxy.py", line 73, in getObjectThumbnail
    [commonTools.extractServerId(objectId), getApplicationToken(),

  File "/usr/lib/glasnost/glasnost/proxy/DispatcherProxy.py", line 546, in callServer
    return _callServer(serverAccessor, functionName, arguments)

  File "/usr/lib/glasnost/glasnost/proxy/DispatcherProxy.py", line 416, in _callServer
    result = apply(getattr(serverProxy, functionName), arguments)

  File "xmlrpclib.py", line 1096, in __call__
    return self.__send(self.__name, args)

  File "/usr/lib/glasnost/glasnost/proxy/DispatcherProxy.py", line 92, in __request
    verbose=self.__verbose

  File "/usr/lib/glasnost/glasnost/proxy/DispatcherProxy.py", line 140, in request
    raise fault

UnknownServerException: