I'm struggling with the custom lightning component on this part. I don't have much background coding and am having trouble finding resources to help me achieve coding the lightning component. If someone could help give me some framework code to create a custom lightning component to hold a URL or direct me to a resource that help break this down I'd be very appreciative.
 

In Trailhead > Reports & Dashboards > Extending Reports using the AppExchange 

I get the the follwoing error message even though the "Wedges" are setup correctly on the "New Trend by Source" Pie Chart.   Images attached showing error message & visual of Pie Chart.
Any input or wisdom would be greatly appreciated. 
Joe Johnson