| ERROR | string is not of string type |
| CAUSE | When opening the file to be placed in a copy or backup set, to be inspected, or used as the target for an incremental restore, its header was not recognized as a valid file header for a file of the indicated type (datafile, archived log, or control file) belonging to the current database. |
| ACTION | The indicated file cannot be processed. Ensure that the correct files are being specified for the copy or backup operation. |