"Failed to Delete Dataset" on Bookstack Reinstall Attempt

[pr0927]

Hey all, need an assist please. I had installed Bookstack, and it was being a bit finicky - giving me unknown errors on login. I suspected a corrupted database or something. Stopped the app, then deleted it.

Then went to re-install. Strangely enough, I got this error (yes, on mobile - same error I saw on desktop):

Thought a reboot might work - it did not. Same error.

Would appreciate a point in the right direction. Thank you!