Items Removed

Hello, I have been having some major trouble when placing CC lots and when I ask the creators I never get a response back even when seeing other people ask the same question. It doesn't matter how long I've painstakingly downloaded every single piece that's included and made sure that the files weren't too deep in folders, no matter what it constantly says that items are removed and replaced. I don't know what to do at this point. I'm not a builder or a decorator and the builds I've downloaded are the exact ones I need or I can't play the game :( Please, I really hope someone can help me. I've attached a screenshot down below. Also, this is in a brand new save file too.