I'm receiving the following error on challenge #6 of the Lightning Superbadge:

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: Delete failed. First exception on row 0 with id 0035000002hUBgRAAW; first error: DELETE_FAILED, Your attempt to delete Sam the ninja could not be completed because it is associated with the following adventure packages.: null, null : []

Looking at the Developer Console, it looks like the code which checks the system is forgetting to delete the Adventure Package records before deleting the Contact. Has anyone else run into this issue?

Thank you!

I seem to have no clue what's wrong in the report which I created. As per the requirement - Summarize the report by Account Name, the contact’s Full Name, and show the Hobby Name." Here I do not understand Full Name, as in the report we only get First Name, Last Name.
The error says - 
Challenge Not yet complete... here's what's wrong: 
The 'Lightning Hobbies by Contact' report does not appear to have either the correct report type or (most likely) the correct columns.

I have summarized the report by Account Name, then by Last Name. Another column shown is Hobbies Name. The report filter is on Hobby Type (the bucket field) = Outdoor Activities and it is locked.

Does anyone know whats wrong?