Mac Ultimate Crash on Server Connect

[OliApocalypse]

FTB Launcher version: 1.2.3
Minecraft Version: 1.4.7
Java version: Version 7 Update 1.7.0_17
Detailed description of the issue / how can the issue be recreated: I modified the Utimate mod pack to exclude GregTech and ExtraBiomesXL, after which i added Mo' Creatures and Biomes O' Plenty. The game launched fine, but when i tried to connect to a server, which my friend could connect to just fine, it crashes and gives me these crash reports...
ERROR #1: http://pastebin.com/6sW8UZeS

ERROR #2: http://pastebin.com/fbubAqt5

 

[Booker The Geek]

FMLClientHandler.disconnectIDMismatch

Are you running the same mods as the server? You need to ask them to send you a copy of their config folder and replace yours with it.

 

[OliApocalypse]

I think I messed up my config files in Ultimate somehow, but re-installing the entire FTB & Ultimate seems to have fixed the problem!