Private modpack constantly crashes after startup

[Tornado3019]

Whenever I go into a world with my pack, it shows a single frame (the world hasn't loaded yet) then goes into "Shutting down internal server" then to "A fatal error has occurred, this connection is terminated" then goes back to title screen, any ideas what's causing it?
Game log as there is no crash log: http://pastebin.com/4dTnPMN3
(Wasn't exactly sure where to put this so i put it here, move it if need be.)

 

[ShneekeyTheLost]

Private mod packs are officially unsupported, so you probably aren't going to be getting a lot of help.

That doesn't look much like a user log, it doesn't have many of the metrics that could be used to determine why you are having issues. Looks like a lot of errors related to missing textures. Might want to start there.

 

[Tornado3019]

I'm not sure how to rectify the missing textures issues, tried updating all the mods in the log with missing textures and didn't help.

 

[Xavier Clinquart]

What you can always try is removing each mod one by one to find the one causing your issue