Right, it looks like you’re missing a bar line at the start, and that confuses the parser.
Instead of

Gm7 C7 | F |
.... Put
| Gm7 C7 | F |

We can make the code add a bar line in situations like that, but for now, insuring that it starts with a bar line should fix it. And you’re right, one of the examples had that typo too. It’s likely a common thing that people would not put a bar line to start with so that would be a good fix,

Have Fun!
Peter Gannon
PG Music Inc.