Message Oracle ORA-28024 - must revoke grants of external roles to this role/user

ERRORmust revoke grants of external roles to this role/user
CAUSEThe user or role altered to IDENTIFIED GLOBALLY has external roles directly granted - these must be revoked, since external roles cannot be granted to global users or roles.
ACTIONUse REVOKE to revoke the external roles from the user or role to be ALTERed.