New world isn't working
So I go into create a sim, make a new sim just to test out the new pack, and everytime I load into the new world, and select the 'Casita Del Mor' lot, this error appears.
When I reboot the game, the family I made isn't anywhere, but the save is.
I've also tested this with families in the gallery, and both result in this error.
Please test with no mods or custom content, as in, move the Mods folder to the desktop.
If that doesn't help, please try playing in a clean user folder. Move the entire Sims 4 folder out of Documents > Electronic Arts and onto your desktop, and when you launch the game, if it launches, a clean folder will spawn with no content. (Your saves and other content will be intact in the folder you moved but temporarily not read by the game.) Don't add anything to the new folder yet; just let me know whether you can get far enough to start a new save and play in live mode for a bit.