when loading

when loading this onto my custom map, is there anything special I need to run or do.. each time I load this prefab onto my map and load into the game I get the following error with red screen errors

Exception (cs:110006): NullReferenceException: Object reference not set to an instance of an object. BikeVehicleAudio.%696003c6e0ef7f4274a563a90749f0fa84245792 () (at <00000000000000000000000000000000>:0) BicycleAudio.OnClientTickStopped () (at <00000000000000000000000000000000>:0) %09df8371f924f3031c324ef0b818bb4f5fbf6140.%109125cfb28b02c271db3576d158e6802d025661 (UnityEngine.GameObject %53fc138266c4961a70e5a9642cddb3243cb46fed, System.Single %09d6e991e9dcb5fdda865265b0fe2da830c150b4) (at <00000000000000000000000000000000>:0) Client.%24195ba95461152dca4ea625c91604ceec20cc2c () (at <00000000000000000000000000000000>:0) Client+<DoClientConnected>d__49.MoveNext () (at <00000000000000000000000000000000>:0) UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at <00000000000000000000000000000000>:0) %09df8371f924f3031c324ef0b818bb4f5fbf6140:%109125cfb28b02c271db3576d158e6802d025661(GameObject, Single) Client:%24195ba95461152dca4ea625c91604ceec20cc2c() <DoClientConnected>d__49:MoveNext() UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)