52107: RtdNotification: Invalid custom key for GCMERROR: 52107error-52107 page anchorERROR Error - 52107error---52107 page anchor RtdNotification: Invalid custom key for GCMrtdnotification-invalid-custom-key-for-gcm page anchor Possible Causespossible-causes page anchor Rejected custom keys are provided to Gcm field of notification. Possible Solutionspossible-solutions page anchor Not provide rejected custom keys to Gcm field of notification.