How to stop pop up "accept incoming network connections"

This was not happing in the past, but now, everytime I open a project, I get this popup.

How do you stop this!? I’ve tried clicking accept and deny, and neither stops it from popping up the next time a project is opened.
I’m running macOS Sierra (updated) Ive tried 4.17 and 4.18 and am using Xcode 8.3.3.
Thanks