Packaging Error. "cannot open input file 'Box2D.lib'"

Im trying to build the beta demo of my game and I keep getting this message in the Output Log

UATHelper: Packaging (Windows (64-bit)): UnrealBuildTool: LINK : fatal error LNK1181: cannot open input file ‘Box2D.lib’

I cant find the solution on the net or why I need the “Box2D.lib”. The only thing I can find is that Box2D.lib is maybe needed for only 2D games, but my game is only 3D. I tried packaging a game by using the starter content in a new project but the same error occurs. Do I just need Box2D to fix the problem? Im asking first before downloading it because I have no idea if something like that would cause problems, and that installing it seems rather complicated to me.

Extra info. I tried packaging in 64-bit and 32-bit. Ill get a different error with HTML5 packaging so Im just going to focus on fixing 64 & 32 bit problems.

Im using Visual Studio 2015

Sorry if I forgot any important information.