This error can be generated during a backup operation when VSS fails to create a snapshot and the alternate Paramount Software snapshot (pssnap.sys) driver fails to start.
The following solutions are available:
- Reboot the machine and attempt the backup again. It is possible that the machine was not rebooted after Macrium Reflect was installed. The alternate snapshot driver requires the machine to be rebooted before it can start successfully.
- Reinstall the software, reboot the machine and attempt the backup again.
Ultimately it is advisable, and highly desirable, to get VSS working correctly on the computer that you are attempting to backup.