'Source code does not match the bytecode' when debugging on a device

Question

I have an app which I am compiling against API level 21:

and then debug it on a real device with API level 23:

The problem is when I try debugging

Answer 1

My app is compiled on API LEVEL 29, but debugging on real device on API LEVEL 28.I got the warning source code does not match the bytecode in AndroidStudio.I fixed it thought these steps:

1. Go to Preferences>Instant Run: uncheck the instant run

2. Go to Build>Clean Build

3. Re-RUN the app

Now, the debug runs normal.