Custom Modpack Launch Issues

[Eleventy49]

A few friends and Myself have set off on a quest to create a custom modpack. For the last few days I've been trying to find a way to get the modpack to download to the Technic Launcher. I finally got Dropbox to work when I came across a new problem. Our modpack, which contains most of tekkit legends, plus thermal expansion and thaumcraft at the moment, would only launch in vanilla. I'm sure you've seen this error before, but none of the threads I found offered any help, so here is what my console spit out after making an attempt to launch the modpack.

http://pastebin.com/YUkH8XdZ

[plowmanplow]

• Custom modpack issues belong in the Platform Pagoda forum.
• Always provide either the API URL or a link to the modpack's platform page.