Ahh so the antennae of doom strikes again haha. Thought I should redirect you to >this< (https://feral-heart.com/smf/index.php?topic=58680.0) thread as the same exact problem happened to this user. If you installed any map packs with items or any custom meshes as of recent, they could be the culprit. In that case, you could either restore your object folder back to default using the default Media folder sub-folder download >here< (https://feral-heart.com/smf/index.php?topic=58064.msg792807#msg792807) and replace the entire folder with the default download. Secondly, delete all of the files in exports as it could be from a map's object files. Not entirely sure but I hope this gives you some fix.
You could also opt to reinstall your game but if you have a lot of mods, that may become tedious.