Google Maps SDK signature not valid Error


I am trying to implement google maps features to my app. I am using this plugin to implement native maps SDK :

And also I get basic idea from this demo :

But when I run my app I am getting this error from Android Studio logcat:

V/GoogleSignatureVerifier: signature not valid. Found: and (Very long hash key)

I searched this error and lots of people said this issue about Google Maps Android Key. But I tried same key with Ionic Market demo app. That just working fine.

Is anybody face this issue before ? Any suggestion would be great ? Because I created tens key on Google Maps API :slight_smile: