I'm sorry but I had no idea what mca was until I googled it just then. This is my first time ever using Forge and I guess I had put that there trying to play it.
Sorry for all the fuss.
I've never heard of Minecraft Comes Alive... I played with only 2 mods on 1.5.2, Optifine and Durability101...
Lex, Forge created it's own Jar so whatever is in it is a problem with your installer.
This is my first time using FML so please excuse any stupid mistakes I may have made.
I downloaded the installer for 1.6.1 and ran that then set my Minecraft Launcher to run Forge instead of default 1.6.1.
It went all fine for a moment but the game crashed. I have these crash reports:
Minecraft crash report: http://pastebin.com/uEjRFt4W
Using the minecraftterrortest.bat: http://pastebin.com/dfjW7fh7
ForgeModLoader-client-2.log: http://pastebin.com/y8udisRn