Message Oracle RMAN-06805 - SET NEWNAME command has not been issued for tempfile string

ERRORSET NEWNAME command has not been issued for tempfile string
CAUSEA SWITCH command was specified for a tempfile, but no destination was specified and no SET NEWNAME command has been previously issued for that file. An explicit file to switch to must be specified if no SET NEWNAME command has been issued.
ACTIONCorrect and resubmit the SWITCH command.