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Katrin WedekindKatrin Wedekind 

Error in Trailhead Unit Challenge

While doing the Discover Lightning Actions Unit: I am getting the following Error Message:

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: QHWBUROU

Did try to use a brand new DE and installed only the required package.
Best Answer chosen by Katrin Wedekind
NagendraNagendra (Salesforce Developers) 
Hi Katrin,

Sorry for this issue that you're encountering. Can you please double check
that your Developer Edition Org does not have any namespaces setup in it?Trailhead does not support namespaced DE Orgs and so if you have a
namespace registered for the DE Org, you'll need to sign up for a new one
and complete this module there.

When trying trailhead, we encourage users to create new Dev org's such that the previous config changes do not affect the trailhead challenge settings.

For more information please check this link:
Hope this helps.

Thanks,
Nagendra.