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Shiva RajendranShiva Rajendran 

Trailhead error even when i followed the steps in the new trailhead org.(Discount Calculator traillhead)

I have tried the Build a Discount Calculator traillhead.I followed the steps as given in the trailhead. I got the below error.

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: WUNARPLY
So i did the same steps again in a new trailhead org but still got the same above mentioned error with different error id. Want to know how to find a solution to this in trailhead?
Best Answer chosen by Shiva Rajendran
Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Shiva,

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.

Rahul Kumar