Couldn't Prepare Animations

[Maclimes]

I'm encountering this error with the start_random_sex_sims_picker_dialog.

 

I am able to do solo just fine. I am able to do most sex just fine. Threesomes work, too. But as soon as I attempt to add a fourth partner, I get the error message. I know I have several appropriate animations installed. The characters are simply on the floor, and I have multiple appropriate animations installed (such as Azmodan22's set). The genders and number of participants all match. None of them are related or in relationships or anything else I can think of that might cause them to not participate. And it seems to happen no matter what configuration of Sims I use. Does anyone know what might be causing this? I'm hoping I overlooked something obvious...

 

Thanks in advance!