After I installed Minecraft Forge and I logged in a black screen appears saying FML is setting up the environment. After the loading bar hit 100% an error appears. This is the picture of the error: http://prntscr.com/j2l3f
The forge I used is Minecraft Forge 6.0.1 and my Minecraft version is 1.4.2. I downloaded the forge here: http://www.minecraftforge.net/forum/index.php/topic,2968.0.html
I haven't put Modloader or anything else to my minecraft.jar. Only forge.
And here's the log: