Solved I have a bug with MCP 1.7.2 :(

Hello guys, I need your help with MCP 903 (1.7.2)
I have recompile & reobfuscate my client with MCP, I have drag all the reobf files in a clean 1.7.2.jar and I tried to open it with the Minecraft Launcher, but It does not work.
Here's the error :

Code:

Exception in thread "main" java.lang.IllegalAccessError: tried to access class bgq from class net.minecraft.client.main.Main
    at net.minecraft.client.main.Main.main(Main.java:95)
Java HotSpot(TM) Client VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

I tried many things like making a new MCP, doing things like updatemd5, decompile and others, but no one has worked !
I don't find the help !
Could someone helps me please?
Thanks !

 

First of all, it took me a bit to realise that MCP stands for minecraft coder pack, it would be smarter to just say it. And second, I know this is the alternatives section but is this really the place to be at? Doesn't MCP have a help forum or something? And third, I looked on the newest MCP site (modcoderpack.com) and it appears that it's for 1.6.4, 1.7.10 and 1.8 only, not for 1.7.2, I would update to a later version of MC or just use MinecraftForge.
Edit: Found this on the bottom of the MCP website: http://gyazo.com/8e472c46fab0c7638bc7ecd4e7f3c8df

 

Forge is not easy to use...
I don't understand lots of things, like why we should call a class like GuiMainMenu "GuiMainMenuCustom" but not "GuiMainMenu" ? Because when we try to reobfuscate with a Custom class name, the class is not Obfuscated
Or, could I recompile and rebfucate my actual client and drag it on a forge ?

EDIT : The 1.7.2 of MCP was available to download 1 year ago