Cannot open project in TwitchDeveloperRig

When I try to open a Project file (json) that has already been created in TwitchDeveloperRig, I get an error “unexpected token json at position 0” and cannot open it.
How can I resolve this issue?

Check the conents of the JSON file and fix it manually.

Or just restart from scratch.
You can import the project from the dev console, so the only missing thing(s) will be the created views