This error appears in the event viewer when the scheduled task "ScheduledDefrag" runs.
Cause: In most cases this is cause by the -k switch which tells the defrager to perform a slab consolidation on the selected volume. This will cause an error for slabs that are less than 8 MB, and will commonly toss an error on HyperV VM's.
Solution: remove the -k switch from the task.
- Open scheduled tasks, Microsoft, windows, defrag: "ScheduledDefrag"
- Now click properties, actions, edit [start a program]
- under add arguments(optional): remove the -k and click "ok", "ok"
That's it, your done.