Oracle Error RMAN-06188: cannot use command when connected to a mounted target database

Oracle Error Message

RMAN-06188: cannot use command when connected to a mounted target database

Reason for the Error

An attempt was made to issue a command that can be used only when there is no connection to the target database or when the target database is not mounted.

Solution

Dismount the database or restart RMAN and use the command before connecting to the target database.