Run Client failing and I can't find and error (there are other problems with this mod)

There are some weird things going on with my mod. it has over 300 elements and each element is important so i don't want to delete any. Recently I added a lot of things to the mod and now not only have I not been able to run the client, but now when i export the mod it will crash upon loading the world or just freeze at 100% while loading the world. I want to eventually figure out what went wrong and fix it because i've been working on this mod for about a year and I don't want to give up on it. Here's the "Run Client Failed" exit Log