My Minecraft world won't load without crashing?

Okay so I am using Technic on Mac, I have 3 worlds, I am able to open 2 of them fine, but the third and my main one will not load without crashing.

I get to the main menu, click single player, select the world, it says downloading terrain, takes me to the main menu and then closes the program. The other worlds work fine no problem at all.

My thought was to delete the most recent save file but i can't find the individual save files if there even are any in my Minecraft folder.

Any idea would be great, and I would really appreciate the help.
Added (1). Apparently the error is Description: Exception in server tick loop. Hopefully that helps

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