Where would I look to fix this issue?
Looks like the project manifest JSON files for one of your projects in the $IGNITION/data/projects directory is malformed.
Should I just start going through each project and find which $IGNITION/data/projects/x/project.json has been most recently modified?
If you don't have too many that might be reasonable.
Any idea how you might have ended up in this state? Hard shutdown / power failure? Bad git pull?
This gateway has over 20+ people working off of it. There are so many fingers in this I have no idea what could of happened. Found the issue I think, somebody did a git pull which has a merge conflict.
It's fixed now, somebody pushed their merge conflict into one of the project manifest files. I just had to delete the conflicting lines and restart the gateway, and it is back to normal now.