Repeating error in Windows Tile

I’m getting an error that just seems to happen periodically, in the windows tile version of the stable .B, it reads:

DEBUG: Error in lua command: [string “mod_callback(“on_day_passed”)”]:1: attempt to call global ‘mod_callback’ (a nihil value)

what exactly does this mean, and is there a way to fix it?

What mods are you using?

I wasn’t, as far as I could tell, using any mods, but a fresh download seems to have fixed things. I noticed several oddities in comparison to the fresh download, like the fresh download had more tilesets and the like, so I’m going to chalk it up to something funky going on with either the download or the unzip