Ive been playing on my modpack for quite a while now with little to no issues and earlier today i tried to load up my world and it would crash once it got to "building terrain" - im assuming this is possibly an id issue which i dont know how to fix Im sure i could just delete my world but I would rather not do that! The Log is below
From what I see, I believe that Extra Utilities is causing the crash (more precisely, the Ender Quarry). Try downloading the latest version again and placing it in your mods folder. If that doesn't work, try going to USER/YOURNAME/AppData/Roaming/.minecraft/config, double click on forge.cfg, and change removeErroringTileEntities to true.
If you would like assistance, please locate your crash log, copy it to pastebin.com and then share your crash log's link here in this thread. Once you have done that, we can attempt to help you with your crash.