I got the item removed popup the first time I entered a lot in Ravenwood after installing L&D. But I have not gotten it again when I visited any of the zones or lots in that world or any other world. This is not the first time this has happened for me on installing a new pack, although I can't remember what pack it was now. But I do remember reading somewhere that the item was a game item, a tree, that had not been tagged correctly. It was eventually fixed but it did take a while. I suspect the same thing has happened again with something out in the world in Ravenwood.
Since you keep getting the message, there are a couple of things you can do to try to fix it. Repair the game, and if that doesn't work, uninstall the pack, and reinstall it. Tbh, if it isn't fixed with the repair, a reinstall probably won't work but it is something you can try if the message continues to bother you. You never know what will work sometimes with an error like this.
Hope this helps.
