Virtual Box 5.0 Snapshot Save Error

I had been running Virtual Box 5.0 on a 64-bit Windows 7 Professional system. I used the snapshot icon frequently to back up whatever I was doing. However, I recently hit this error:
VERR_SSM_LIVE_GURU_MEDITATION
I don’t seem to be able to properly figure out what went wrong. For a little while, before everything completely stopped working, I was able to take a snapshot and override a previous one; though, after a while, that didn’t work either.
I became incapable of erasing the snapshots and got error messages every time I tried. Can someone help me, please?

