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 0034100000Gl2XjAAJ; 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 : []

I found on a different thread a possible solution, but it didn't work.
Just a quick update, I was able to resolve this issue by removing the strict lookup relationship to Contact on the Adventure Package object. The Explorer__c field was set to "Required" and "What to do if the lookup record is deleted?" was set to "Don't allow deletion of the lookup record that's part of a lookup relationship.". I updated the "Required" to false and changed "What to do if the lookup record is deleted?" to "Clear the value of this field. You can't choose this option if you make this field required."

Can't seem to get past this error.



I double checked the titles of the folders and reports and I don't see any problems.



Here is my dashboard



 

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 0034100000Gl2XjAAJ; 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 : []

I found on a different thread a possible solution, but it didn't work.
Just a quick update, I was able to resolve this issue by removing the strict lookup relationship to Contact on the Adventure Package object. The Explorer__c field was set to "Required" and "What to do if the lookup record is deleted?" was set to "Don't allow deletion of the lookup record that's part of a lookup relationship.". I updated the "Required" to false and changed "What to do if the lookup record is deleted?" to "Clear the value of this field. You can't choose this option if you make this field required."

Getting this 
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: AUAWOAHH

I *did* create a new org for this superbadge. Anyone having issues like this?
 

Can't seem to get past this error.



I double checked the titles of the folders and reports and I don't see any problems.



Here is my dashboard