Since using Synx Xcode Assistant no longer works

[Fawxy]

I used synx on my project and since then my Xcode 9 assistant has given me "No assistant results". I checked out the commit before the synx and it worked again, and then checked out the synx commit and it stopped working.

I've tried removing references to all the files and readding them, but no joy. I've cleared the build folder, cleared derived data and nothing has seemed to help.

Has anyone else faced/solved this issue?