Oracle Solution for Error ora-19675

ORA-19675: file string was modified during proxy copy

What triggered the Error:

proxy backup of the specified file failed because the file was brought on-line or otherwise modified while the proxy backup was in progress. This file was off-line or read-only when the backup began, so the file was not put into hot-backup mode, therefore no modifications are permitted while the backup is in progress.

What should we do to fix it:

ke another backup of this file.