CRUZADO_101 Glad to hear that worked for you. To repair the game in Steam, right-click the Sims 4 tile and select Properties > Installed Files > Verify integrity of the game files.
ShaeNotShea If you see this error again, please test with a different lot. Even though mods and custom content don't transfer through the Gallery, their effects can.
I'd also like to take a look at the lot you downloaded even though the repair may have fixed the issue. If you're willing, please link it, or else name the creator and lot so I can find it myself.