500 Internal Server Error

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

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/cherrypy/_cprequest.py", line 670, in respond
    response.body = self.handler()
  File "/usr/local/lib/python2.7/dist-packages/cherrypy/lib/encoding.py", line 221, in __call__
    self.body = self.oldhandler(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/cherrypy/_cpdispatch.py", line 60, in __call__
    return self.callable(*self.args, **self.kwargs)
  File "/srv/ipol/demo/lib/base_app.py", line 169, in init_func
    x = func(self2, *args, **kwargs)
  File "/srv/ipol/demo/app/123/app.py", line 381, in result
    height=image(self.work_dir + 'input_0.png').size[1]
  File "/srv/ipol/demo/lib/image.py", line 154, in __init__
    _deinterlace_png(src)
  File "/srv/ipol/demo/lib/image.py", line 21, in _deinterlace_png
    im = PIL.Image.open(path)
  File "/var/www/.local/lib/python2.7/site-packages/PIL/Image.py", line 2609, in open
    fp = builtins.open(filename, "rb")
IOError: [Errno 2] No such file or directory: '/srv/ipol/demo/app/123/tmp/34D9610A10CAE0FC9EDF0BD70F0E86C4/input_0.png'
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