Try this. This helped me out with the same issue.
http://forums.technicpack.net/threads/potential-fix-for-offline-no-packs-error-parsing-pack-info.54630/
If you're running Windows, the below link might also help.
http://forums.technicpack.net/threads/potential-fix-for-offline-no-packs-error-parsing-pack-info.54630/
Amazing work. I knew it was an issue with connecting to the internet, but didn't know it was due to IPv6. I appreciate the help, and, if you don't mind, will be shamelessly plugging it anytime someone has the issue.