Make sure to use the same prefect version as I did in the article to follow this guide. Prefect has recently changed how the API communicates with agents - the new Prefect version 0.14 uses RunConfig. Check it out in the docs if you want to use the new way. And if you have any technical issues, reach out to the community via Slack, there are several people there who certainly know more than I do to help: prefect.io/slack