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It worked! The problem was, that I had several Java versions installed at the same time. After uninstalling them it started working again.
Thank you very much! ^^
For some reason my FTB-launcher doesn't work after i deleted the ftblauncher folder in my %appdata%.
I would be very thankful if someone could help me. You can find the log at:
http://pastebin.com/vdm8V9MJ
Thanks in advance.