google app engine - iOS GCM error code 501 -

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recently start error code whenever try use gcm apis in ios app: error domain=com.google.gcm code=501 "(null)"

i couldn't find meaning of anywhere? http-status code, meaning not implemented?

i'm getting error first @ line of code: 

        gcmservice.sharedinstance().connectwithhandler() { error in  if(error != nil) {   print(error) } }

calling method prints message :

gcm | gcm registration not ready auth credentials

and error error domain=com.google.gcm code=501 "(null)"

the error occurred because calling 

gcmservice.sharedinstance().connectwithhandler() { error in  if(error != nil) {   print(error) } }

before had received registration token, or had failed refresh token.

"error domain=com.google.gcm code=501 "(null)" " bad error message.


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