ORA-22287: invalid or modified directory occurred

admin

ORA-22287: invalid ormodified directory occurred during stringoperation
Cause: The directory alias used for the current operation isnot valid if being
accessed for the first time, or has been modified by the DBA since the lastaccess.
Action: Ifyou are accessing this directory for the first time, provide a valid
directory name. If you have been already successful in opening a file underthis
directory before this error occured, then close the file and retry theoperation with
a valid directory alias as modified by your DBA. Oracle recommends that
directories should be modified only during quiescent periods.