Cook Failed - Unknown Cook Error

So I’m relatively new to UE4, and I’m trying to package my game for windows 64 bit, but I’m getting an unknown cook error. I have no idea what it is. One, possibly unrelated thing is it’s telling me I need Visual Studio 2015, but I’m only using blueprints and behavior trees. I’ve also been able to package in the past.

Output Log: UE4 output failure - Pastebin.com

List of plugins enabled: Plugins Enabled - Pastebin.com

Can someone tell me why this is happening and how I can fix it?

Also, please don’t tell me to delete Config, Saved, and Intermediate, because last time I did that it deleted everything in by Content folder. (I had a backup)

I’m using First Person blueprint template if it helps.