BuildPipeline.BuildPlayer stops working after 2017.1.2p2

I am trying to upgrade my project to anything greater than 2017.1. The game works fine, when I upgrade and fix the obsolete warnings.

However, when I build using the command line via Jenkins, BuildPipeline.BuildPlayer returns a string of: “6 errors”. I don’t understand what that means nor why there are 6 errors. I tried just passing in the scenes and no parameters, and I still get the same string returned.

If you take a look at the entire log output, you should be able to find additional information on these errors.

Yea, funny thing is there are no errors previously.