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Achuth SharmaAchuth Sharma 

Challenge Not yet complete -

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: MLNKBVFT
David HalesDavid Hales
Hi Achuth, 

Basically, this kind of error comes when there are configuration level/code level changes invoking at same places. 
For example
Two validation rule for the same field or more than one trigger invoking the same object. In that case, you need to either create new trailhead playground org or you can turn off the related validation workflow and triggers for the object and fields. 
or else you can use one more developer org for this purpose. 

Hope this helps. If it helps please let us know by hitting best answer as this will be helpful for others in the community too.
Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Achuth Sharma,
  • Please check if you have connected to same DE org where you have done your work in the trailhead.To do this Go to Trailhead Profile -- settings -- make the DE org which you have worked as default then check the challenge.

Please refer below link how trailhead playground works. Hope this helps you!
  • Please mark it as best answer if the information is informative.so that question is removed from an unanswered question and appear as a proper solution.

Thanks
Rahul Kumar

 
Achuth SharmaAchuth Sharma
Yes I did check the same. Error still persists
Briana-Rose SekulicBriana-Rose Sekulic
I am having the same problem - 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: JDIKKXIF...  I filed a complaint August 15th but am still not able to resolve. I am 96% done the coiurse and want to complete.