Bug Modpack Download Errors!

[em.]

I've tried to download different modpacks but they all end with the same error, a little popup box comes up saying "error downloading modpack". Previsiously downloaded modpack works perfectly, Agrarian Skies Modpack, but that's the only modpack that works.

http://pastebin.com/WwrmwG5u

 

[Chaka]

Try downloading the latest version of the launcher and the pack, Try to uninstall the launcher then reinstall it.

 

[em.]

Try downloading the latest version of the launcher and the pack, Try to uninstall the launcher then reinstall it.

I force updated the loader and it all worked! ;D