[notmattlythgoe]

In your Chassis subsystem you have an OI declaration, remove it.

FYI, your XBox class looks perfect.

I have also attached my version of the XBoxController and PS4Controller classes for anybody out there that would like to use them. We are working on creating a utilities library and will post it later. I have not tested the mappings on a robot yet, so if you notice anything that is not mapped correctly when you use it please let me know.