Why isn't the Feed Circulation Graphic being displayed correctly?

The feed circulation graph is a service of Joost de Valk's SEO Blog. It requires that the FeedBurner Awareness API be activated for the feed in your FeedBurner account.

Occasionally, the feed circulation graph may still show an error (e.g. JPGRAPH error) even after the Awareness API is activated.  Initializing the graph may resolve this.  To do this, visit http://www.joostdevalk.nl/code/feedburner-graph/ and enter the FeedBurner address for the feed in question.  This will generate the graph, and make it available to on your HTML preview page afterwards.

This Q&A was found on: https://nukeseo.com/modules.php?name=FAQ&file=index&myfaq=yes&id_cat=3