Hello im not English or american but I am german so I try to explain my Problem

So I Installed the Mod and it works fine and I build a lot of things in my map.Later all objetcs were away and I say that all of the Mods has a Error in the Error logs it was alwasy the same like "DA UFO #1 is set up as large,but is not tagged as large." or often also ..is not layerd as.... somtimes there is the Problem "Missing navigation data.Highly recommend to fix. Itryed all reinstall the mod restart the game but it dosnt works.