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Alan MurrayAlan Murray 

Trying to verify a step [Create Chatter Groups] - reference error id: NHHZARKC

I am trying to check a challenge and I am getting this message. 

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Step not yet complete in Creative Koala Playground
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: NHHZARKC
SwethaSwetha (Salesforce Developers) 
Hi Alan,
The error is similar to GACK ID in salesforce.Most of the times, these go away when you try the challenge in a new playground or keep trying multiple times. If the error still persists, please use the below link to reach out to the Trailhead Support team so that one of the Engineers will get in touch with you and assist further.
Support Link: https://trailhead.salesforce.com/en/help?support=home

Please mark this answer as best if it helps so that others facing same issue will find it useful. Thanks
Alan MurrayAlan Murray
I fixed the issue using another solution. The formatting was not correct. Following the instructions in the challenge was wrong.
SwethaSwetha (Salesforce Developers) 
Hi Alan,
Thanks for sharing the fix that worked for you. As you said the instructions in the challenge were wrong, I strongly recommend reporting this to the Trailhead support team for further investigation.

Thank you 
Swetha Maddali
Salesforce.com Support
Senior success engineer Tier 2
Alan MurrayAlan Murray
HI Swetha, 
You have a  signature of 'Senior success engineer Tier 2', what exactly do you do? I have spent hours trying to figure out this problem, and you want me to spend more time reporting it.

Salesforce is a multi-billion dollar comapny made possible by consumers such as myself, we pay your salary, not the other way around. You can't expect me to waste more time, I have already sepnd hours trying to figure out this problem. You know what the problem is, use your resources to get it fixed.