52102: RtdNotification: Invalid GCM registration tokenERROR: 52102error-52102 page anchorERROR Error - 52102error---52102 page anchor RtdNotification: Invalid GCM registration tokenrtdnotification-invalid-gcm-registration-token page anchor Possible Causespossible-causes page anchor Wrong GCM registration id or was registered via SDK or REST Binding API. Possible Solutionspossible-solutions page anchor Update registration/binding with correct GCM registration id.