FTB Ultimate doesn't open/generate maps while direwolf20-pack does

[Kruppi]

When i start FTB Ultimate and try to generate a new map the usual process starts: "Loading world. Converting world" After that nothing happens until ftb crashes without message after a while.
With the direwolf20-pack everything works fine.

I am using Windows7 with Java64 and already tryed it with reinstalling the hole mod (also deleted the ftb-folder in Appdata).

 

[Azgult]

With crashes without a message do you mean the console closes too? If not, please paste the log.

 

[Kruppi]

Ah. This time i choosed "show console" and hey came to the step "Building terrain".

Here, the log: http://pastebin.com/63are0qr

edit: I also tryed the mindcrack-pack. It works fine, too.

 

[Azgult]

java.lang.NoClassDefFoundError: mv

Well that's... odd. It can't find one of minecrafts base classes... Try doing a force update, for some reason the minecraft jar seems to be corrupted.

 

[Kruppi]

And how do i force an update?

 

[Azgult]

In the launcher options -> force update and then just launch as you would normally.

 

[Kruppi]

Ok, at least he seems to load something in snail-speed http://pastebin.com/sGqguKgp

Maybe it is just enchanted by the devil or something. If it won't work i maybe try the mindcrack-pack. It seems very interesting and complete, too.