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it has to be done in order to make sure that our loggers catch minecraft errors, and don't fail when minecraft crashes and enables us to launch minecraft using optimal parameters, and the correct versions.
have you tried running the pack before when you are online?
packs will not launch if they have not been run at least once in online mode.
due to being on vacation it might take me a few days to get back to you
if anyone who has this issue has any logs it would greatly assist me in trying to fix this issue.
Feel free to come to #ftb on http://www.esper.net/publicirc.php to speak to me more directly.