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Jung MunJung Mun 

App Customization Specialist Step2 System Error

I am using a new DE trailhead and here is my error code.
Let me know what would be the problem with this.

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: DMJLOZDA

Jung MunJung Mun
App Customization Specialist Step 2 system code error