This user has the following games installed:
Sims 3, World Adventures, Ambitions, Late Night, Generations, Pets, Showtime, Supernatural, Seasons, University Life, Island Paradise, Into the Future
Isle of the midnight sun won't let me put my sims in base game version
Instead I get this message:
There is an empty lot already in the world.
What's the deal? :x
It also happens with only 1 sim.