Launcher won't launch any modpack

[RestInPIeces]

I have recently started using a mod pack on technic known as Wizard Academy R6, it was working a first but now anytime i try to load it up through the launcher it'll load all the way up to "installing Minecraft Assets," the launcher will close as if it's about to load the modpack but it just reopens the launcher like nothing has happened, and now it appears to do the exact same thing to any of the mod packs I try to load up.

Please Help

Thank You

crash-2017-08-03_18.23.14-client.txt

[camospyro]

use pastebin attachments dont appear to work