My app doesn't work after Build (Android apk)!

I have a serious problem and i need help ASAP.
After i created my app and i did the build to export the APK file and try it on my phone. i install the application on the phone whitout problems but when i try to lunch it, it’s not working .

Hi @Abdelhamid, could you give some more details about that? What is not working exactly? Do you receive any error messages? What device are you using?

Hi @Colin, i didn’t received any error messages; just the application can’t be lunched ! but anyway i solved the problem thank you

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