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I'm doing the simple lightning components challenge and have hit this problem in my existing trailhead org and a brand new dev org that I've just created:

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: QVWBQHAG
390 answers
  1. Dec 11, 2023, 11:10 AM

    I got the same error, then i closed all tabs and logged in again, next go to dashboard and refresh the page once, next refresh the dashboard once again until all the data appears correctly, now you can complete the challenge.

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