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I'm having problems with the couple of Mod packs I've tried within the FTB Launcher. I've tried copying in the arguments from the OP but I receive the same crash report which I will include here.
This should be not the fault of the arguments it is another error. Please delete the libraries folder just inside the FTB folder. Restart the launcher and launch a 1.6.4 pack and let the libraries redownload. That should fix this error. Look here for more info.
Moved these posts out of the JVM arguments thread. Unless you have a specific and reliably traceable issue linked to JVM arguments, you should make a new thread with these kinds of issues.
Thank you Vauthli. Now Baneon could you please post a new console log? Preferably by using the 'Paste my log to pastebin.com button and providing the link that is created at the bottom of the console.
Ugh, the log was removed. Please repost it. The logs normally get removed every 12 hours, or was it 24?, by default. If you register at pastebin you can set it so the log will not get removed after a period of time.