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Amjith veettil 1Amjith veettil 1 

Error in Trail head. reference id KMBSDJYC

The challenge in this trailhead https://trailhead.salesforce.com/modules/sales_admin_sales_reports_for_lex/units/sales_admin_sales_reports_unit_3 is giving the error . Error is 
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: KMBSDJYC
Pankaj Yadav 16Pankaj Yadav 16
Can ou share the screen shot of error and it would be good if we connect on skype to solve the problem
 
NagendraNagendra (Salesforce Developers) 
Hi Amjith,

As suggested in the below link I tried for myself and found that above error is displayed if Titles are not given for the Dashboard.
Please refer below screenshot.
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