I keep getting an error message, and I'm not sure why. Yes, I have hacks and custom content. The error started occurring when I installed apartment life. I think I have, at this point, updated all of my hacks, although it is possible that I missed one if it's from the days before I thought to put all the hacks in one spot. HCDU doesn't have any abnormal conflict errors (I have two hacks that it claims conflicts but that have never caused any problems, and removing one does not solve the problem).
The error message occurs in any circumstance (nothing particular seems to set it off) although I don't recall it happening on community lots. I do, however, get it whether or not any sims are present on the lot.