Oracle Message ORA-10548 - Cannot perform block media recovery on a read-only plugged-in datafile.

ERRORCannot perform block media recovery on a read-only plugged-in datafile.
CAUSEAn attempt was made to perform block media recovery on a read-only plugged-in datafile.
ACTIONConvert the plugged-in datafile to read/write and reattempt block media recovery.