Failing for None Type

[hema1117]

File "ac2git.py", line 4100, in
AccuRev2GitMain(sys.argv)
File "ac2git.py", line 4080, in AccuRev2GitMain
rv = state.Start(isRestart=args.restart, isSoftRestart=args.softRestart)
File "ac2git.py", line 3304, in Start
self.RetrieveStreams()
File "ac2git.py", line 1630, in RetrieveStreams
assert stateRef is not None and dataRef is not None and len(stateRef) != 0 and len(dataRef) != 0, "Invariant error! The state ({sr}) and data ({dr}) refs must not be None!".format(sr=stateRef, dr=dataRef)
AssertionError: Invariant error! The state (None) and data (None) refs must not be None!