My modpack wont work

[Hagor]

So I have been playing this mod pack for a few days when all of the sudden it crashed so i tried to load it back up again but it wouldn't load. I tried to reinstall the mod pack but whenever I click install after it's done it still says install even though the mod pack is in my library so can someone please help me!

[AetherPirate]

Pastebin a log by opening the launcher, clicking the cog wheel in the top right, then open logs in the lower left. Open the most recent log and paste the entire thing into ubuntu.pastebin.com, and paste a link to that here.