Message Oracle RMAN-05017 - no copy of datafile number found to recover

ERRORno copy of datafile number found to recover
CAUSEA RECOVER COPY command was not able to proceed because no copy of indicated file was found to recover. Possible causes include the following: 1. no copy of indicated file exists on disk that satisfy the criteria specified in the users recover operands. 2. copy of indicated datafile exists on disk but no incremental backup was found to apply to the datafile copy.
ACTIONOne of the following: 1. Use or correct TAG specification to recover a different datafile copy. 2. Use BACKUP FOR RECOVER OF COPY command to create necessary incremental backup or copy.