Unable to launch modpack after clicking the play button

[ObliviousStranger]

I recently downloaded the launcher and afterwards Pixelmon Generations modpack, and when i click the play button it closes and reopens the launcher after it finishes downloading the "Minecraft assets" and i tried updating my graphics card, reinstalling the modpack, and even reinstalling the launcher to no avail. I could really use some guidance please.

Here's the log:

https://pastebin.com/T74r2BkS

[JaariAtmc]

So, why are you using Java 7u5? That version is way too old. Go to Java 8 already.