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Gauri Shankar Singh
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: WTTTJIEW
I have completed all the task but it gives error that i have to create new playground but I have already used all 10 playgrounds
Try in new playground org if you still see issues kindly reach out to trailhead support team.
https://trailhead.salesforce.com/help
Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future.
Thanks,
Try to Login With New Org/New Playground Then u not get the error
https://trailhead.salesforce.com/help
Thanks,