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NehaaaNehaaa 

Adv apex specialist challenge step 2: 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: Update failed. First exce

Raj VakatiRaj Vakati
Refer this links 

https://techevangel.com/2018/06/01/superbadge-advanced-apex-specialist/

https://techforceservices.com.au/salesforce/salesforce-advanced-apex-specialist-trailhead-superbadge/

http://lucascalegari.com/category/platform-developer-ii/
https://developer.salesforce.com/forums/?id=9060G0000005OViQAM