Hello~ Vuforia Support:

I use your videoplayback sample code  , building environment in android studio  and related files put in environment.

After build success and generate apk , then run app to test function.

To the VP_about page is OK,but when I press start button , app happen  unfortunately stop and exit.

I check  AndroidManifest.xml 、SampleAppiication folder and  VideoPlayBack folder , but environment don't have any error.

Code also copy sample code   ........

What's happened ??  Umm......