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EJ DrustEJ Drust 

I can't complete the challenge on Analytics Basics / Start Exploring Analytics. It's giving me an error that "The 'Trailhead_Data_Manager' app was not found."

NagendraNagendra (Salesforce Developers) 
Hi Drust,

Sorry for this issue you are encountering.

I would suggest you to use trailhead playground to complete wave related challenges separate from your dev org which should probably do the trick.

If you are doing challenge correctly then it can be linked issue. You have to link Trailhead to Salesforce.

Follow the below link, do set up your Salesforce org to trailhead & complete your challenges.

https://force.desk.com/customer/portal/articles/2643793-trailhead-profile-signup-login-faq?b_id=13478 

I hope it would be more helpful for you.

If it solves your problem, mark as a solution.

Thanks,
Nagendra