google app engine - iOS GCM error code 501

Question

Recently I start to get this error code whenever I try to use the GCM apis in my iOS app: Error Domain=com.google.gcm Code=501 "(null)"

I couldn't find the meaning of this anywhere? Is that actually the HTTP-status code, meaning Not Implemented?

I'm getting the error first at this line of code:

        GCMService.sharedInstance().connectWithHandler() { error in  if(error != nil) {   print(error) } }

calling the method prints this message :

GCM | GCM registration is not ready with auth credentials

and the error is Error Domain=com.google.gcm Code=501 "(null)"

Answer 1

Waitting for answers