This is not letting me proceed with challenge but when I test in my org, this field is working. Will attach error next

Cannot get the custom console component to display when following directions in the unit Configure a Salesforce Console. A few of us are trying to do this and it doesn´t display. We have followed step and saved and refreshed but it just doesn´t show up in left margin. What setting are we missing?

This is not letting me proceed with challenge but when I test in my org, this field is working. Will attach error next