If you're in Hell, and stand near grapes, and hit enter and click squish fast enough, you get "A wee problem: Error: (0) can't find the itemstack to work with".
Similar issue with squeezing chickens if you jump into the air and hit enter to do an action (or, "enter" when you're on the ground and it has jumped to avoid you), sometimes they are out of range/reach and a similar error is reported.