RMAN > could not access datafile Error

This error is occur when RMAN is not able to access the desired datafile.

RMAN>  backup database skip inaccessible;
 Starting backup at 10-AUG-17
 using target database control file instead of recovery catalog
 allocated channel: ORA_DISK_1
 channel ORA_DISK_1: SID=7 device type=DISK
 could not access datafile 10
 skipping inaccessible file 10

Solutions :

RMAN> restore datafile 10;
Starting restore at 10-AUG-17
using channel ORA_DISK_1
creating datafile file number=10 name=/data/DB12CC/datafile/dummy.dbf
restore not done; all files read only, offline, or already restored
Finished restore at 10-AUG-17
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