Is Feral Heart crashing at the startup page, or when you try to enter the map? Reasons for the map to crash/not load may be caused by...
-Any duplicate particle files can cause your game to crash. Check in your Feral-heart>>media>>particles folder and delete any files ending in _0,_1, etc.
-There may be lots of meshes with a high polygon (triangles) count. These can sometimes cause lagging and even crashing if your computer can't handle them. It might be best to reduce the use of these or remove them.
-Sometimes weather cycles can mess with the game. If your map won't load due to a weather cycle, you could try removing it, or at least make the cycle less frequent.
Other reasons may include misplacing/moving an essential file, so be sure you've put everything in the correct folders.