Issues on UpdatePlayerLocation (PLZ HELP!!)

[KitsuneDev]

Good Evening,
I'm trying to use this library on a Sync Application, but, when I get to ´UpdatePlayerLocation´, throws a really strange exception!
Can anyone help me with this please??
Exception):

Activated   Event   Time    Duration    Thread
    Exception: Exception thrown: 'System.MissingMethodException' in mscorlib.dll ("Method not Found: 'Google.Protobuf.Collections.RepeatedField`1<POGOProtos.Networking.Envelopes.Unknown6> POGOProtos.Networking.Envelopes.RequestEnvelope.get_Unknown6()'."). Exception thrown: 'System.MissingMethodException' in mscorlib.dll ("Method not Found: 'Google.Protobuf.Collections.RepeatedField`1<POGOProtos.Networking.Envelopes.Unknown6> POGOProtos.Networking.Envelopes.RequestEnvelope.get_Unknown6()'.") 78.05s      [4524] <No Name> 

Thank you, Gabriel