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Ronald OlechRonald Olech 

There was an unexpected error in your org which is preventing this assessment check from completing -Lightening superbadge

Trailhead Lightening Excperience superbadge, step 6.  I've tested the functionality and it is working, but I'm getting an error verifying it.  I was on pace for a first ascent too.

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 00341000001rOfEAAU; 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 : []
Best Answer chosen by Ronald Olech
Ronald OlechRonald Olech
I found the way to fix it in this thread: https://developer.salesforce.com/forums/ForumsMain?id=906F0000000kHdlIAE - according to this author, the test failed because the contact was required on the adventture pack, which prevented the test data from deleting.