UAT Automation error

Hello, everytime I try to package my game for Windows x64 I keep getting this error at the beginning of the build.

Program.Main: ERROR: An item with the same key has already been added.

I’m running a source build that has console support enabled. Should I create a seperate build for Windows?

I need to get this project up on steam today.

Full error:

link text

I switched to the Non Sourced build and that seems to have let me build just fine. Any reason why this error happened?