• Tejbir Singh 10
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Trying to complete "Community Rollout Strategy" and Create Sharing Rules Unit. Everytime I click on "Check Challenge", I get this error: 

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.QueryException: List has no rows for assignment to SObject


Any advice? Or do I have to start a new DE org?