Failed to invoke Method PlayerServerRPCRouter

Code:

Failed to invoke Method PlayerServerRPCRouter:C with 2 parameters: 168, 205, 17, 1, 67, 170, 83, 162, 20, 5, 0, 1, 4, 0, 0, 247, 116, 123, 63, 248, 132, 218, 189, 11, 244, 29, 62, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, , Sender: Player Client (6), timestamp: 16667.562
(Filename: C:/buildslave/unity/build/artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 65)
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: Operation is not valid due to the current state of the object
  at System.Collections.Generic.Queue`1[IProjectile].Peek () [0x00000] in <filename unknown>:0
  at System.Collections.Generic.Queue`1[IProjectile].Dequeue () [0x00000] in <filename unknown>:0
  at BowItem.FireServer (.EquippedHandlerServer handler, .BowItemEquippedState state) [0x00000] in <filename unknown>:0
  at BowItem.UpdateEqippedServer (Single delta, .ItemInstance itemInstance, .EquippedHandlerServer handler, .InputControls& input, Int32 slotNumber, Boolean gearSlot) [0x00000] in <filename unknown>:0
  at EquippedHandlerServer.Think (Single tickSize, .InputControls& input) [0x00000] in <filename unknown>:0
  at NetworkEntityManagerPlayerServer.Tick () [0x00000] in <filename unknown>:0
  at NetMovementServerPlayerOwned.ReadClientUpdate (Int32 messageTime, .InputControls& input, uLink.NetworkMessageInfo info) [0x00000] in <filename unknown>:0
  at NetworkEntityManagerPlayerServer.C (uLink.BitStream stream, uLink.NetworkMessageInfo info) [0x00000] in <filename unknown>:0
  at PlayerServerRPCRouter.C (uLink.BitStream stream, uLink.NetworkMessageInfo info) [0x00000] in <filename unknown>:0
  at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
  --- End of inner exception stack trace ---
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
  at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <filename unknown>:0
  at #=qdOCccKsXCENJ9qtwQM1$fTAPYexakK6D3KmUuKhiFWk=.#=q8mOJmxLPFyyFGkGXlkRYtA== (System.Object #=qHb38bdS59HEX_PXCg5OGDA==, System.Object[] #=quonTxdkUuvD6dahYX7$jOw==) [0x00000] in <filename unknown>:0
(Filename: C:/buildslave/unity/build/artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 65)

[DOUBLEPOST=1456318117][/DOUBLEPOST]Does anyone know what this means?