When creating a chart in an Adobe Workfront report, a key requirement is that at least one grouping must be defined. This is necessary because the chart needs a way to organize and display the data visually, and groupings provide the categories or series that the chart will use to aggregate and represent the data.

Open Report Builder:

Navigate to the Reports area and create a new report or edit an existing one.

Define Grouping:

Go to the 'Grouping' tab within the report builder.

Add at least one grouping to categorize the data. This could be based on any field relevant to the data you are reporting on, such as project status, task owner, etc.

Create Chart:

After defining the grouping, switch to the 'Chart' tab.

Select the type of chart you want to create (e.g., bar chart, pie chart).

Configure the chart settings, ensuring that the defined grouping is used for the chart's series or categories.

Save the Report:

Save the report to ensure that the chart is correctly configured and displayed based on the defined grouping.

This requirement is covered in the Workfront documentation and training materials that explain the prerequisites for creating charts in reports (Webinar - Admin Essentials - User Experience - Apr 27, 2022).