ry changing your rendering system to the Direct one not OpenLG.
This happened to me a couple times, actually when exporting a map.
If this isn't the trick, check back and let us know!
You should maybe consider thinking about how big your map is, and how many objects you have used. I know that polys on objects, and the collisions for objects that are not installed to the game by default can cause an issue during the exporting process as your computer might not be able to handle the size of the export needed. Think you could share with us the size of the map, and what object packs you may have used in it as well?
If you're having trouble still launching the game at this point to find out this information for us, you can alternatively look at Local Disk (C:) \\ FeralHeart \\ Media \\ Terrains and open up your map's folder, then open up the mapnameObjects.cfg to locate what you have used, and how many times you have used it. To find out the map's size, then that can be located in the same folder, only it would be named mapnameTerrain.cfg.
Another problem could be due to you using a fire or other particles that you have installed to the game when it's already there now by default from the latest patch (1.15). Try removing those from your my_objects folder if you do have them there.