[4.17.2] How to fix this compile error? UEBuildDeployTarget.OutputPath, but there are multiple (or no) OutputPaths

Woke up this morning and after implementing some new code my project won’t compile in Visual Studio 2017.

Throws the following error:

Attempted to use UEBuildDeployTarget.OutputPath property, but there are multiple (or no) OutputPaths. You need to handle multiple in the code that called this (size = 0)

Im not sure what this relates to. I thought maybe my directory configurations got borked but they look ok…
I can’t find anything related to this with a google search.
Anyone know what this error means?

Nevermind.
A full Rebuild worked, and I can do regular Builds again.

Ill leave this up in case anyone sees this error and doesn’t recognize it.