I'm on the "Visualizing Your Data" unit and I got down to the challenge which I believe I completed correctly but I get this error:

Challenge not yet complete... here's what's wrong: 
One or more of the following is incomplete in the Dashboard: no component uses the 'Cases by Status' report as a source report, your component does not have a 'Cases by Status' header, and/or your component does not have a 'New vs Closed' title.

I've checked this five or six times and have created the dashboard twice.  Not sure how to progress from here.  Any help will be greatly appreciated.

I need help with a Trailhead challenge that I can't get a pass on:

• Create an approval process to support a case escalation procedure, with the ability to approve directly from Chatter.Verify Chatter Approvals is enabled and the Case standard object has Chatter feed tracking turned on.
• The approval process must be created on the Case object and be named 'Case Escalation'. No entry criteria is required for this approval process and you can set yourself as the approver.
• Upon entering the approval process, approval request notification needs to be posted to the Chatter feed.

This should be so easy! I can clearly see that the approval process is working and that it appears in the feed, but I still get an error. What am I missing?!

Challenge not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Process failed. First exception on row 0; first error: NO_APPLICABLE_PROCESS, No applicable approval process was found.: []

Appreciate any help!