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You will pass the exam with not error. I 've heard of people with this issue solving it that way.
If it solves your issue please mark this answer as correct, it may help others.
For all the Trailhead issues please report it here,
https://trailhead.salesforce.com/help?support=home#
https://trailhead.salesforce.com/help
So that our trailhead support engineers will look into it and get back to you.
I hope you find the above solution helpful. If it does, please mark as Best Answer to help others too.
Regards,
Salesforce Support.
@Agustin B I tried creating a new playground but still i could see the same error
Kindly use a developer edition to pass this challenge. A trailhead playground may not help you pass this challenge.
If the error still persists: https://trailhead.salesforce.com/en/help?support=home
Please mark this answer as best if it helps to help others.