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Henry BurnsHenry Burns 

I followed the directions for app exchange and changed the chart to a pie chart but it keeps telling me it isn't a pie chart

See it's a pie chart but trailhead keeps saying:
Challenge Not yet complete... here's what's wrong: 
The 'LEAD Trend by Source' dashboard component is not a pie chart.
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NagendraNagendra (Salesforce Developers) 
Hi Henry,

Please check with below steps to complete the challenge.
  1. Open "Reports" tab
  2. Look up "3 - Sales & Marketing Adoption" dashboard
  3. Select Edit (Action column) on the "3 - Sales & Marketing Adoption"
  4. Click "Edit Attributes" (wrench) on the "New LEAD Trend by Source" dashboard
  5.  Uncheck "Use chart as defined in source report" checkbox
  6. Choose type of chart as pie and wedges as lead source
  7. In the last step please click on save button on the dashboard page as shown in the below screenshot.
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Once converting the dashboard into pie chart and clicking on save button i have completed the challenge.Please check the below screenshot for the same.
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This might be the only reason you are getting the above error.I tried the same in one of my developer org's and was able to validate the challenge succesfully by following the above steps.

Please mark this as sovled if it's resolved.