No resource identifier found for attribute

The com.admob.android.ads.AdView tag was giving messages: Multiple annotations found at this line: – error: No resource identifier found for attribute ‘backgroundColor’ in package – error: No resource identifier found for attribute ‘refreshInterval’ in package – error: No resource identifier found for attribute ‘keywords’ in package – error: No resource identifier found for attribute ‘primaryTextColor’ in package – error: No resource …