Is that part of a Dev.exe error message? I think you get it if you put fighters on a ship (mesh) that doesn't normally have any (most frigates/cruisers). If that is the case be warned, as the fighters will spawn at the bottom-left? of the map, and will only be useable after you make a phase jump or two (I haven't tried rebuilding them in combat yet, but the entire squad gets spawned way ouside the playabe map when it's first created)
I don't know how to solve it except only putting strike craft on ships that normally have them (again, the "mesh" counts, not the ships' .entity file)