gradle build falling

[LastLightSith]

The gradlew build fails with error:-

> Task :compileDebugJavaWithJavac FAILED
/home/smit/Development/godot-stable/godot/modules/GodotAds/admob/AdMob.java:206: error: <anonymous org.godotengine.godot.AdMob$4> is not abstract and does not override abstract method onRewardedVideoCompleted() in RewardedVideoAdListener
                mrv.setRewardedVideoAdListener(new RewardedVideoAdListener() {
                                                                             ^

But after adding
public void onRewardedVideoCompleted(){}
at line 215. It builds successfully .