When  I try to verify the exercise on Create Reports and Dashboards for Sales and Marketing Managers
Visualize Your Data trailhead.

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: