From the swarming task page if I click to view Isolate Inputs I get a 500 error: The server has either erred or is incapable of performing the requested operation.

The log on the cast-swarming appengine job show this error: 


'files' (/base/alloc/tmpfs/dynamic_runtimes/python27g/350d926c06a7e859/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py:1552)
Traceback (most recent call last):
  File "third_party/webapp2-2.5.2/webapp2.py", line 1535, in __call__
    rv = self.handle_exception(request, response, e)
  File "third_party/webapp2-2.5.2/webapp2.py", line 1529, in __call__
    rv = self.router.dispatch(request, response)
  File "gae_ts_mon/config.py", line 256, in dispatch
    time_fn=time_fn)
  File "gae_ts_mon/config.py", line 218, in _instrumented_dispatcher
    ret = dispatcher(request, response)
  File "third_party/webapp2-2.5.2/webapp2.py", line 1278, in default_dispatcher
    return route.handler_adapter(request, response)
  File "third_party/webapp2-2.5.2/webapp2.py", line 1102, in __call__
    return handler.dispatch()
  File "components/auth/handler.py", line 193, in dispatch
    super(AuthenticatingHandler, self).dispatch()
  File "third_party/webapp2-2.5.2/webapp2.py", line 572, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "third_party/webapp2-2.5.2/webapp2.py", line 570, in dispatch
    return method(*args, **kwargs)
  File "components/auth/api.py", line 1620, in wrapper
    return func(self, *args, **kwargs)
  File "components/auth/api.py", line 1577, in wrapper
    return func(*args, **kwargs)
  File "handlers_frontend.py", line 288, in get
    json_data['files'].items(),
KeyError: 'files'

Error: https://pantheon.corp.google.com/errors/CIbWkaLY3Y3gsgE?time=P30D&project=cast-isolate&organizationId=433637338589