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Diamond PollardDiamond Pollard 

Trailhead : Create Reports and Dashboards for Sales and Marketing Managers - Visualize Your Data

I Keep getting this error when trying to verify the challenge: 

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: EKMKLUAI

I created a brand new playground and got the same error. Help!
NagendraNagendra (Salesforce Developers) 
Hi Pollard,

Sorry for this issue you are encountering.

I've just completed this Step, you need to adjust scales and mixed up the description.

The solution here is to mirror the picture you see at the end of the Guide and to add a 4th Component "Metric Chart" based on "Opportunities by Rep" Report with the following details:
User-added imageAdditionally, you need to shrink this one, as well as the Table and the Gauge by 1 so that all 4 fit into the Dashboard:
User-added image

May I also request you please confirm if you are using a brand new developer org in order to validate this challenge, if not then I would suggest you create a brand new org and give a try which should probably do the trick.

If you are using a brand new developer org then please double check that your org doesn't have a namespace enabled. If that doesn't help please give a try by restarting the batch.

If the problem continues,  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.

Hope this helps.

Kindly mark this as solved if the reply was helpful so that it gets removed from the unanswered queue which results in helping others who are encountering a similar issue.

Thanks,
Nagendra
Diamond PollardDiamond Pollard
I've done all of these things except checking if Namespace is enabled. Not sure how to do that. But, here's my dashboard and I created this particular playground specifically for this challenge since my original one was giving the error as well. 

A Screenshot of a dashboard
Dan Adams 15Dan Adams 15
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Dorian SabitovDorian Sabitov
Hi! Maybe my answer will be a little late, but I know that many people face an error when trying to verify the challenge. I write detailed reviews of Salesforce apps and to avoid such issues, you can check out the step-by-step setup guide - https://www.sfapps.info/salesforce-crm-dashboards/. It will be useful for those who are looking for an answer to your question.