500 Internal Server Error

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

Traceback (most recent call last):
  File "/home/lamp/vpython/lib/python2.7/site-packages/CherryPy-3.1.2-py2.7.egg/cherrypy/_cprequest.py", line 606, in respond
    cherrypy.response.body = self.handler()
  File "/home/lamp/vpython/lib/python2.7/site-packages/CherryPy-3.1.2-py2.7.egg/cherrypy/_cpdispatch.py", line 25, in __call__
    return self.callable(*self.args, **self.kwargs)
  File "/home/lamp/src/woost/woost/controllers/cmscontroller.py", line 213, in default
    return self.__dispatcher.respond(args, self.__cms)
  File "/home/lamp/src/cocktail/cocktail/controllers/dispatcher.py", line 251, in respond
    return cherrypy.request.handler()
  File "/home/lamp/src/cocktail/cocktail/controllers/dispatcher.py", line 52, in __call__
    return self.callable(*self.args, **self.kwargs)
  File "/home/lamp/src/lamp/lamp/controllers/servicescontroller.py", line 331, in download_all
    return r.get_download_all_zip()
  File "/home/lamp/src/lamp/lamp/models/reference.py", line 508, in get_download_all_zip
    current_zip = ZipFile(zip_path)
  File "/usr/lib/python2.7/zipfile.py", line 793, in __init__
    self._RealGetContents()
  File "/usr/lib/python2.7/zipfile.py", line 834, in _RealGetContents
    raise BadZipfile, "File is not a zip file"
BadZipfile: File is not a zip file
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