Runtime Error show in my app

I am use admob open add and they show runtime Error in app …I have upload block images and error problem screen shot and apk also please any one help me

demosend.apk (6.6 MB)

Please give solution

Please any one help

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Did you insert Admob App ID

I use admob add on test mode and export apk for check my app work properly or not …so app I’d is required in test mode ?

Yes. add admob app idd