Could not open file MediaPlayerCtrl

[CanBK]

i already import the plugin and script, but when i run it same like the video on youtube, there is an error like this.

Could not open file
MediaPlayerCtrl+<>c__DisplayClass113_0.<Call_Load>b__0 () (at Assets/Youtube/MediaPlayer/Scripts/MediaPlayerCtrl.cs:2544)
System.Threading.ThreadHelper.ThreadStart_Context (System.Object state) (at <599589bf4ce248909b8a14cbe4a2034e>:0)
System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) (at <599589bf4ce248909b8a14cbe4a2034e>:0)
System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) (at <599589bf4ce248909b8a14cbe4a2034e>:0)
System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state) (at <599589bf4ce248909b8a14cbe4a2034e>:0)
System.Threading.ThreadHelper.ThreadStart () (at <599589bf4ce248909b8a14cbe4a2034e>:0)
UnityEngine.UnhandledExceptionHandler:m__0(Object, UnhandledExceptionEventArgs) (at C:/buildslave/unity/build/Runtime/Export/Scripting/UnhandledExceptionHandler.bindings.cs:46)