The availability replica '%1!s!' specified in the READ_ONLY_ROUTING_LIST for availability replica '%2!s!' does not exist. ...

The availability replica '%1!s!' specified in the READ_ONLY_ROUTING_LIST for availability replica '%2!s!' does not exist. Only availability replicas that belong to the specified availability group '%3!s!' can be added to this list. To get the names of availability replicas in a given availability group, select replica_server_name from sys.availability_replicas and name from sys.availability_groups. For more information, see SQL Server Books Online.