Some time ago I created several applications using Appodeal plugin and they all work. They show only banners and smart_banners but with low fill rate. Therefore week ago I started develop my first app with direct AdMob integration. I created code and tested it with test AdMob UnitID ca-app-pub-3940256099942544/6300978111
Even I tested it with real UnitID but with test device ID (128 bits hexadecimal number) which I've got from AdMob. All worked well. I even tried once run it with real UnitID bit without test device ID to be sure it shows real ads. I've got 1 real ad then turned app off. After last weekend I returned to further development. I changed UnitID to AdMob testing ID again. But once I added some functions then assembled and run app - I've got ERROR_CODE_INTERNAL_ERROR 0 inside onAdFailedToLoad(int errorCode) method. Nothing was changed in AdMob call sequences in my app. Even I rolled back to the code from previous week. This didn't help. My app now does not work with AdMob. It receives ERROR_CODE_INTERNAL_ERROR 0 after each banner load attempt. This is true for banners and smart_banners, for AdMob test UnitID and device test ID with real UnitID.
Before error app tells following in console:
I chromium: [INFO:CONSOLE(0)] "Application Cache Checking event", source: https://googleads.g.doubleclick.net/mads/static/mad/sdk/native/sdk-core-v40-loader.html (0)
then it delays for some seconds and tells:
I chromium: [INFO:CONSOLE(0)] "Application Cache Error event: Manifest fetch failed (500) https://googleads.g.doubleclick.net/mads/static/mad/sdk/native/sdk-core-v40-loader.appcache", source: https://googleads.g.doubleclick.net/mads/static/mad/sdk/native/sdk-core-v40-loader.html
W Ads : There was a problem getting an ad response. ErrorCode: 0
W Ads : Failed to load ad: 0
What can be wrong? How can I define what can be wrong? I break my head on monitor glass but cannot find any mistake in code. It works like it worked before but with another result. At Friday I've got test and real banners but at Monday I get only error 0. HELP!!!
By the way - my AdMob account is not blocked. I can access it and I see all my previous apps statistics.