Joulesey

When I press the "play" button, it seems like the modpack is loading up, but then it gets to "Checking Minecraft Assets" and when that one finishes, nothing happens. Just acts like I didnt try to open it. Not really sure whats going on. I just downloaded the latest version of Java so maybe thats it? I dont know. Error code or whatever: https://pastebin.com/2NUhvSNV