Sims 4 Business & Hobbies Pack – Whiteboard Class Bug

emilieparis10  I’ve not run into this yet, but I’ve hardly tried every possible permutation to set it up. What skill are you teaching, and what other activities do you have set for your business?

Just happened to me out of nowhere too. It was working like minutes ago but the next time I open my sim's business, her class keeps getting cancelled because no one joins while there are multiple sims watching her giving the lecture.

This has started to happen to me as well from yesterday. Tried the classes i had set up painting fishing and gardening .They used to work good and was fun now no sims attending and classes get cancelled. I am sad as this was the bits i liked of the pack. The only mod i have is MCCC

Just thought I would add this. I made a sim on next lot and they can do fishing lecture/classes no problem and there business has no problems so far. maybe the original sim was too skilled to run a class ( they had 3 maxed skills and could do 3 classes ) the new sim only has fishing level 6 so far

Its been constant for me! I think I've tried to run over 30 classes and EVERY SINGLE ONE failed, I've never gotten it to work for me. And I'll admit that I've gotten so frustrated, I cried about it lol I'm putting the game down for a while until this either gets fixed or I find a solution. I've even had my settings set to only attend classes and lectures, it never works. Customers just stand around and chat. 

This thread may refer to your issue 
[BH] Several classes/lectures don't work | EA Forums - 11968151

Hello, PipMenace. Essentially, what happens is that I have the whiteboard and start the pottery or painting class or entrepreneurship class, but a few minutes later, the class is cancelled, although there are sims around. The settings I have for the business is pottery, painting and browse and buy (not sure if this is the direct name but essentially the one that enables sims to buy goods around the business). I played around to see if anything would change if I removed the painting and pottery and have added the only attend lectures setting but the same still happens. Not sure why this is happening as I do not have any mods/cc and it was working for a few days after buying the pack. Seems that a few others are having the same issue on this thread. Also in case this matters I am running the business from my home lot.