Oracle Message ORA-15220 - invalid file attribute specification

ERRORinvalid file attribute specification
CAUSEThe keyword UNPROTECTED, MIRROR, HIGH, FINE, or COARSE was specified in a MODIFY FILE clause. These file attributes are immutable once a file is created.
ACTIONSpecify a ZONE keyword; for example, HOT, COLD, MIRRORHOT, or MIRRORCOLD.