Wasn't sure if this was related to the hat stands or not. Never had this error before. I figured I'd post it for others to look at before I take the time to poke around myself. Just cuz I'm lazy.
Ste
ETA: Added another log from a different sim. This time, I was directing the sim to take off the cap. They were standing right in front of the hat stand for the thinking cap. The game lagged a bit, and then barfed up this error.
FYI, the first sim in the first error log, I had queued her up to run to the 2nd floor at a spot right in front of a hat stand, and then I queued up the Take Off Thinking Cap interaction. She began to run upstairs, but unfortunately/stupidly she came back down the stairs and it appeared as if she 'decided' to place the cap on top of the kitchen island counter where the dorm cook serves food. Naturally, I cancelled the stupid interaction, and it barfed that first error log I posted.