urgent dissapearing mesh help for dummies

I am having issues with a mesh of mine, actually two of them. When I place both objects down they disappear. I know there was a previous thread on this where two people mentioned how they solved this problem but I need serious help for dummies when it comes to things like this. Something that I did take from those post was that it most likely is because of the fact that I deleted a few slots on both objects. Please help and really go in detail and break it down if you don't mind.

Here is both files and blends:

www.mediafire.com/file/p8brnoo6uq5acw2/newluxurioussims4_MODERN_CLASS_Dining_Table.package/file

www.mediafire.com/file/d6k4y16m3rwan94/tab.blend/file


www.mediafire.com/file/3x0t687xj4aw9f9/newluxurioussims4_MODERN_CLASS_Bar.package/file

www.mediafire.com/file/qqw70pq74txl84u/bar.blend/file