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Anything else? I did not see anything that stuck out as problematic in the log you provided. Can you launch other packs, and have you tried force updating?
Pergamon, I had that problem. You need to find the folder the modpack makes. It can't acess the files for some reason unless it can detect them. I had them on my desktop and I tried to move them and that happened, as soon as I moved them back it started working. (Although I now have a different problem)