I'm doing the "Lightning Experience Reports & Dashboards Specialist" superbadge" and got this problem in my playground org.

I created this new playground org for this challenge, I finished the third exercise and I got this error.

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: TRCHNVDF