Help, I cannot open a specific modpack and can't find a fix anywhere!

[kiwisprite]

My friends and I have been playing on a Hexx rewritten 4 (beta) server for the past couple of days, but now when I go to open the modpack it says "offline" at the top. When I try to run it, it immediately stops. I tried uninstalling and reinstalling, but when I went to reinstall I got a popup that read "the modpack does not appear to be installed or is corrupted and is not available for offline play." I've tried reinstalling the launcher, deleting and reinstalling the pack, and even checked with a friend to see if they were having the same issue (nope!).  Does anyone know a fix to this?

[JaariAtmc]

Wrong section, you need to post this in Platform Pagoda.

[Lord Ptolemy]

Modpack issue. Moved to Platform Pagoda.