admob getting an ad response. ErrorCode: 0 Failed to load ad:0

Question

I have followed many answers about that error here, but my problem is not solved. Every time I run my app no ads appear and I get this error message in Logcat:

Answer 1

If you are using live admob ads id in development mode application , it will show this error.

Use debug mode admob ads id during development and live admob ids in release mode app