52111: RtdNotification: GCM unknown errorERROR: 52111error-52111 page anchorERROR Error - 52111error---52111 page anchor RtdNotification: GCM unknown errorrtdnotification-gcm-unknown-error page anchor Possible Causespossible-causes page anchor Temporary outage of some components of GCM notification flow or internal bug. Possible Solutionspossible-solutions page anchor Ask customer support for investigation.