I am trying to get through a TrailHead module "AppExchange App Development" and within the unit "Package an AppExchange App ",

I tried completing the Hands-on challenge as instructed and I am very sure that I followed every word as instructed.  I still keep getting the below error for reasons I dont understand.

Here is the 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: ZMFNEVBY"


Any help is greatly appreciated! Thank you in advance.

I am trying to get through a TrailHead module "AppExchange App Development" and within the unit "Package an AppExchange App ",

I tried completing the Hands-on challenge as instructed and I am very sure that I followed every word as instructed.  I still keep getting the below error for reasons I dont understand.

Here is the 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: ZMFNEVBY"


Any help is greatly appreciated! Thank you in advance.