Expected double-quoted property name in globals.json error

Brand new to Hash.ai and am learning the simulation system.

I’m modifying one of the container shipping demo simulations. After making some changes, I now get:

ERROR simulation: parsing [globals.json]: SyntaxError: Expected double-quoted property name in JSON at position 157

But my globals.json is only nine lines long, and with correctly double quoted property names. Is there some hidden globals.json?

Turns out it was a user error…copy/paste and did not remove trailing comma.