GCM registration failed, will retry. GCM error: INVALID_SENDER

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Hi Team,

We are not able to register android devices to UrbanAirship platform , and from android studio we are receiving below error :

                   GCM registration failed, will retry. GCM error: INVALID_SENDER

We have double checked that App server key and GCM sender ID is configured properly. But not sure what is the issue here...!!

Can you please help us investigating this issue further ? Let us know for more information on this.