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Build an Account Reassignment Wizard - Unable to clear 3rd Unit
Hi,
I am working on Trailhead project Build an Account Reassignment Wizard and when I am trying to clear Unit 3, I am getting below error. This is a new Dev Org I am working on. Please help.

I am working on Trailhead project Build an Account Reassignment Wizard and when I am trying to clear Unit 3, I am getting below error. This is a new Dev Org I am working on. Please help.
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: IHNDTRWZ