Oracle Message ORA-01266 - Unable to create unique file name

ERRORUnable to create unique file name
CAUSEUnable to create a unique file name for an Oracle managed file. Oracle tried several names but each file name was already in use in the default destination directory for the file type.
ACTIONRetry the operation. If that fails, also, it may be necessary to change the default destination directory for the file type and then retry.