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Brittany PenmanBrittany Penman 

Challenge Not yet complete... here's what's wrong: There was an unexpected 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: THQMTAKM

I don't understand the problem, can someone help me try to fix it thanks. I'm trying to complete the Lightning Experience Reports & Dashboards Specialist Superbadge. I'm on the 5th challenge.
Khan AnasKhan Anas (Salesforce Developers) 
Hi Brittany,

I suggest you please use a new Developer Org / Trailhead Playground for validating the challenge. If the problem persists, log out of all accounts and log in once again in a different browser by clearing the cache and cookies which should probably do the trick.

Also, this kind of error pops up due to renaming reports or dashboards label after creation or when you Clone dashboards. Thus for any further challenges: DO NOT CLONE Dashboards or Reports. Always create from the scratch.
Try these steps:
Delete the existing dashboards/reports.
Delete it from the bin as well.
Create new dashboards/reports.
Refresh dashboards before checking up the challenge.
Try to Check Challenge.

I hope it helps you.

Kindly let me inform if it helps you and close your query by marking it as solved so that it can help others in future.

Thanks and Regards,
Khan Anas
Fernando SpinaFernando Spina
Hi Brittany,
Just a few minutes ago (before writing this) I was stuck with the same problem, but on Step 7th challenge.
The problem occurred (I guess like Khan Anas said) after clonning my Dashboard.

I in deed tryied with another browser, but didn't work.
To fix the problem, I made this steps:

1) Delete the Clon Dashboard (and from the Bin too - like Khan mention)
2) Rechecked all the steps again (and found that I bypassed one of them and some other 2 were wrong).
3) I made the corrections, save and refresh de Darshboard and.. Voila!! (I passed the Challenge)

I hope this details and Khan details helps you!
Regards!

Fernando.

BTW: Thanks Khan for your response and explaned steps! They worked (in part) for me!