I'm following the instructions for setting up the adwords_api.yml configuration file. I've added the client id and secret to it. I run setup_oauth2.rb, get the access code, so far so good. I enter the access code, the utility asks me if I want to save the token to the config file, and I say yes. But when I look in the file that's generated, all it has is an empty object {}.
Any ideas would be much appreciated. Thanks!