Admob says that ad unit wrong but it's not what's wrong help



im facing problem
my admob banner and interstatial not showing
when i use notifier to find out what’s the problem
it says
the ad request was invalid for instance the ad unit id was incorrect
i checked my ad unit id milion time and created new one but same thing happend
i use 1 ad load that’s all
what’s wrong


Hello Brother. All ads problem are due to Api level of the App.Once the Api level is updated there wiwill be no prblms related to Ads