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Jagadeesh AdaveniJagadeesh Adaveni 

Got Following Error Please help me

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 exception on row 0 with id 0019000001j60UNAAY; first error: CANNOT_EXECUTE_FLOW_TRIGGER, The record couldn’t be saved because it failed to trigger a flow. A flow trigger failed toUser-added imageUser-added image execute the flow with version ID 30190000000D90w. Contact your administrator for help.: []
SandhyaSandhya (Salesforce Developers) 

Hi Jagadeesh Adaveni,

you might have created validation rule on contact object.

I suggest you deactivate the validation rule on contact object and check the challenge.

Go to customize --> contact --> validation rules --> edit uncheck the active checkbox.

Please accept my solution as Best Answer if my reply was helpful. It will make it available for other as the proper solution. If you felt I went above and beyond, you can give me kudos.
Thanks and Regards

Jagadeesh AdaveniJagadeesh Adaveni
Hi Sandhya,

Thanks for your reply.
As i don't have any active validation rules on Contact Object.

Jagadeesh Adaveni
SandhyaSandhya (Salesforce Developers) 
Hi Jagadeesh,

Please see below screen shots if you are doing same.
User-added image

User-added image

Hope this helps you.

Thanks and Regards