I don't have the same problem running that modpack. I have had to delete the entire .technic folder at times when i couln't find a fix. It means you would delete all of your modpacks and installation of the technic launcher. I would find your waypoints if you set any in any modpacks since these would also be deleted. I would only do this as a last resort. It is not enough to just uninstall the technic launcher. It is better to just delete the .technic folder. It will prompt you for what directory to install the technic launcher again once you try to run it. I have had it happen when it bugs out like this and i can't get any modpack to work. I don't see anything in the log that would cause such a error. Please let me know if this works. By the way, were you ever able to run modpacks?
You can also just cut and paste your .technic folder to your desktop for later review.