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sandhya devi 1sandhya devi 1 

If you're using a new DE and seeing this error, please post to the developer forums and reference error id: PIFSVZLT

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: PIFSVZLT
Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Sandhya,
 
  •  I would suggest you log out of all the accounts and log in again and also clear your browser cookies and history.
  • OR Another solution would try it in a different browser.
Hope it helps.

Please mark it as best answer if the information is informative.

Thanks
Rahul Kumar