Random exception: Unknown task ...

[nilp0inter]

Sometimes the registered tasks are not found in the worker.

Traceback (most recent call last):
--- <exception caught here> ---
  File "/usr/local/lib/python3.6/site-packages/buildbot/process/buildstep.py", line 577, in startStep
    self.results = yield self.run()
  File "/usr/local/lib/python3.6/site-packages/washer/master/steps/washertask.py", line 36, in run
    res = yield self.runCommand(cmd)
  File "/usr/local/lib/python3.6/site-packages/buildbot/process/buildstep.py", line 900, in runCommand
    res = yield command.run(self, self.remote, self.build.builder.name)
  File "/usr/local/lib/python3.6/site-packages/buildbot/process/remotecommand.py", line 338, in remoteComplete
    maybeFailure.raiseException()
  File "/usr/local/lib/python3.6/site-packages/twisted/python/failure.py", line 467, in raiseException
    raise self.value.with_traceback(self.tb)
buildbot.process.remotecommand.RemoteException: b'builtins.RuntimeError': Unknown washertask 'requirement_file'
Traceback unavailable