Google Maps Android Authorization Failure

So I've looked over many questions on this issue but have failed to find a solution. Following is the error I'm currently receiving when I try to use the Google Maps Android API.

Solution 1:

Try to Put -

    <meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="***"/>

Instead of-

    <meta-data
        android:name="com.google.android.geo.API_KEY"
        android:value="***"/>

and follow- https://developers.google.com/maps/documentation/android-api/map instructions.