We've all wanted to make games but we're too poor to afford a Windows computer that runs exe files right? Well why don't we put Roblox studio on Android, IOS, and Chromebook. How I would make it work is that i would put it on the play store but with mobile controls that are simple it would be like roblox's PC version of Studio but ported to mobile like how resident evil was ported to android.
In my case the issue was I had installed an app with the package name let's say com.example.package using android studio on my device. I created another app with the same package name and was trying to install it on my device. That is what was causing the problem. So just check on your device whether another app with the same package name already exists or not.
All My Fellows are right but In case of other situations, one of the reason that you get this error is because instead of you Generate Signed Bundle/APK you Build Bundle(s)/APK or install it on your device directly. To avoid this error in the future, from tool bar in android studio go to Build --> Generate Signed Bundle/APK and create you apk files in this method.
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