KeyError: 'url' on docker container

[antoniosap]

Using explicit spec file '/config/fuzzingserver.json'
Loading spec from /config/fuzzingserver.json

Using Twisted reactor class <class 'twisted.internet.epollreactor.EPollReactor'>
Using UTF8 Validator class <class 'autobahn.websocket.utf8validator.Utf8Validator'>
Using XOR Masker classes <class 'autobahn.websocket.xormasker.XorMaskerNull'>

Traceback (most recent call last):
  File "/usr/local/bin/wstest", line 11, in <module>
    sys.exit(run())
  File "/usr/local/site-packages/autobahntestsuite/wstest.py", line 346, in run
    start(options, spec)
  File "/usr/local/site-packages/autobahntestsuite/wstest.py", line 268, in start
    res = wstest.startService()
  File "/usr/local/site-packages/autobahntestsuite/wstest.py", line 235, in startService
    return fuzzing.startServer(self.spec, self.options['webport'], debug = self.debug)
  File "/usr/local/site-packages/autobahntestsuite/fuzzing.py", line 1322, in startServer
    factory = FuzzingServerFactory(spec, debug)
  File "/usr/local/site-packages/autobahntestsuite/fuzzing.py", line 1161, in __init__
    self.setSessionParameters(url = spec["url"],
KeyError: 'url'