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It's almost certainly issues with the specific CC that you're using.
Objects usually require the expansion pack from the item they were cloned from (so if someone made a chair cloning one from Apartment Life, you must have Apartment Life to use the custom chair). Not having that EP can cause your game to crash.
Likewise, houses require the EPs they were built with, regardless of whether or not they used items from the EP to build on that specific lot. Not having the EPs required can cause your game to crash when you load the lot. Lots can also come with CC that may require an EP you don't have, so you may also run into it being lot related, but not specifically the lot.
So it's important to double-check the EPs required if you don't have absolutely everything, only download items that work with the EPs you have, and if you're still running into trouble, only download from really good, popular creators, so you have a reasonably sure idea that they've marked the EPs correctly.
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“Dude, suckin’ at something is the first step to being sorta good at something.”
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