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Ed WomackEd Womack 

Unexpected error when checking Trailhead challenge: Code HBBJPJZP

Here is the message I received when trying to check the "Add a Screen for Thanking the Customer" of the "Create a Satisfaction Survey" project:

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: HBBJPJZP
Ed WomackEd Womack
Ah - I just figured this out - I has missed something in the directions (I'm sure that NEVER happens :)) - the error message was bizarre, but I was nonetheless able to finish the challenge. Thanks!