ORA-19550: cannot use backup/restore functions while using dispatcher

Your RMAN connection is going thru SHARED SERVER Mode.
Make a TNS entry with DEDICATED Mode ( (server=dedicated) ) and try again.


19550, 00000, "cannot use backup/restore functions while using dispatcher"
// *Cause:  Attempted to use backup/restore functions while connected to the
//          dispatcher in a shared server.
//          This is not allowed because the device that is
//          used for backup and restore must remain allocated to a single
//          process.
// *Action: Connect directly to the instance then re-execute the backup or
//          restore function.