The screenshot shows a simple workflow. The Execute Code activity in the center of the screenshot has an error in it, indicated by a red circle icon in the top right corner of the activity. In the top right corner of the Diagram Builder, there is a Messages icon, depicted by a speech bubble with an exclamation point in it. There is a red circle with the number one inside it next to the icon, indicating that there is one error in the workflow.

The Messages list is open in a dialog box. There is one error message: "Activity -> Activity -> Source -> PL/SQL Code is required!"