Fails to parse valid yaml

I wanted to try out this adapter. I used a little utility to convert the json to yaml. Tried it out and got this error:
```
{"level":"info","ts":1611044403.9202049,"msg":"using provided configuration","config_file":"/config.yml","config_adapter":"yaml"}
run: adapting config using yaml: template: yaml:464: bad character U+0022 '"'
```

I know it is valid yaml. More odd is there is no double-quote character on line 464

I know this is not much info to go on. Any suggestions on how I can figure out what is wrong?