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Elizabeth GardnerElizabeth Gardner 

Lightning Rollout Specialist Superbadge

This is super frustrating.  I have completed Challenge 8 successfully, but get this error

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: GQNDQNGL
We are all facing the same issue Liz, just look at other posts. I have posted in Twitter too. Help is on the way.
Trailhead team have fixed this issue -
I just clicked Check Challenge button and its done.