Minecraft Forge 9.11.1.965 Will Not Start - (fixed)

[Kalinco]

Hi there,

I just installed Forge 9.11.1.965 for 1.6.4 because some of my mods were outdated. When I press 'play' on the launcher window, it disappears like it would normally do but then reappears. Apparently it crashed but there is no crash report. I can only guess that Forge failed to load.

 

Here is the link to the ForgeModLoader-client-0.log file.

 

http://pastebin.com/rpBhmUx9

 

Thanks in advance for any help

 

Kalinco

 

EDIT: I tried to launch it without an empty mods folder and the same thing happened.

[luacs1998]

Check your coremods. One of them is derping.

[LexManos]

 

2014-01-12 11:42:49 [FINE] [ForgeModLoader] Runtime patching class aa (input size 0), found 1 patch

Soemthing has messed up your client so that 'aa.class' does not exist, it needs to exist.

Delete /versions/1.6.4 and version/1.6.4-Forge*

And reinstall.

[Kalinco]

Thanks a bunch lex. I have no idea what caused it to derp...