For life of me I can't figure out what this exercise is asking to do.  I was able to modify other reports but this particualr R&D report, Temperature to kWh Research, I'm not able to do.  Error is keep saying, "We can’t find the additional analysis by model being performed on the 'Temperature to kWh Research' report. Remember that you can organize data horizontally and vertically at the same time."




 

I'm doing the simple lightning components challenge and have hit this problem in my existing trailhead org and a brand new dev org that I've just created:

Challenge not yet complete... here's what's wrong: 
There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: QVWBQHAG