Assets/Plugins/x86/VuforiaWrapper.dll: access denied.

I was import the VideoPlayback-6-2-6.unitypackage.
But, this error message accurred.
I do not know what caused it.


My PC : Windows10 64bit
Unity : Unity 5.5.2f1 (32-bit) / Unity 5.5.2f1 (64-bit)

Any luck?