NetworkBehaviour bug?

I'm getting and error from networkbehaviour script, i followed an video tutorial from gamer to game developer and it says the following:

 InvokeCommand class [Player] doesn't match [SyncPlayerPosAndRot])
 UnityEngine.Networking.NetworkIdentity:UNetStaticUpdate()

At first it spammed for more than 3,000 messages to me about 3 errors, but then i combine rotation and position scripts which had cmd features and now get a senseless error to my [player] prefab object.

The error will only appear on run-time. no compile errors.

After it has spammed my console for 3K messages, the other players rotation and position commands stop working also!