Oracle Solution for Error ora-10549

ORA-10549: Cannot perform block media recovery using a read-only plugged-in backup datafile.

What triggered the Error:

An attempt was made to perform block media recovery using a backup of a read-only plugged-in datafile.

What should we do to fix it:

Reattempt block media recovery using a backup taken after the plugged-in datafile has been converted to read/write.