If you face the above error message while working on your first android app, the solution is very simple. You just need to add one simple line code in your project AndroidManifest.xml
android:fullBackupContent="true"
The final AndroidManifest.xml file looks like below:

Now re-built your project and see the error message.
Isn’t it too simple? If you know a little bit of coding then it will be so easy to fix the problem otherwise it might take you several days to fix it.
Thank you for reading my blog.