can't see admob banners in libgdx app-Collection of common programming errors

I added the code as it is written here

But I can’t see banners with ads in my game. My app is published. But the current version is not published yet. I’ve added to manifest:

There is a similar thread here

But I could not understand the answer there. They wrote: You don’t need to have an app already on the market to get a Publisher ID for a new app. In the Android Package URL field that’s on the “Add Site/App” form, just enter “market://details?id=your.package.name”. You’ll of course want to replace the ‘your.package.name’ with your app’s actual package name. The viewWidth warnings are fine and you will likely still see them after inserting your Publisher ID.

I don’t understand where should I include “market://details?id=your.package.name”.

Logcat shows me the following errors: w/Ads (3200) Invalid unknown request error: Cannot determine request type. Is your ad unit id correct? w/webcore(3200): can’t get the viewwidth after the first layout

My publisher key is correctly inserted to the code. BTW it was printed in logcat. (Is it possible to exclude printing it?)

Thanks