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Vuforia 7.5.26 build error

I am using unity 2018.2.8f1  and Vuforia 7.5.26  but I having errors when build to Android 

the error is : 

Unable to find shader Custom/VideoBackground 

 

please Any help

Hello,

Vuforia recently moved the video background shaders to Vuforia assets and out of the Unity Editor. This should go away when accepting the popup message to update assets.

If you did not get the popup, you can resolve the issue by taking the following steps: