Working on the Lightning Experience Reports & Dashboards Specialist superbadge, I'm at Challenge #7 (Create the SolarBot dashboard) and getting the following error:

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: IWVYGERW

This is a new trailhead org, created excusively for completing this bage (no other Trailhead modules have been worked in this org). I had a similar unexpected error in a different org, on my previous superbadge -- also when creating dashboards, and corrected it by doing a dashboard refresh. Tried the same thing here, to no avail. Even with a freshly "refreshed" dashboard, I get the error. 

Any suggestions? Could not find the IWVYGERW error code in discussion forum searches.

I've been working on this superbadge, near the end I got to this part:

Ada also tells you that the SolarBot Status Averages report needs some tweaks. First, the Support team wants to see trends over time, so they want the report to show data by week instead of by day. Second, they want a graph for this report called Weekly Panel Temperature and kWh that shows average panel temperature and average kilowatt hours as lines over time. Third, they want to see this graph on each SolarBot record page. Create the page and call it SolarBot Status Page With Chart. Include only information about the individual SolarBot in the chart.


What kind of page should I go for? I created a Lightning Record Page, a page layout, and it is not detecting any kind of page
Thanks in advance