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: HOUUTJHI

Hi:  I've searched this issue and have found a few threads however none of the solutions have worked for my module.  The following exercise is contingent on this one working so I'm at a sticking point with a small, simple trail.  

The error is as follows:  "Your lead is missing a field mapping for the Opportunity.Discount_Percent__c field. For help, talk with your admin or see Map Custom Lead Fields for Lead Conversion in Salesforce Help."

I tried to map the field based on the salesforce help and other threads in addition to deleting the Opportunity and starting fresh.  I contemplated deleting the "Discount Percent" field all together but was nervous to do so.  I watched someone Youtube solution to no avail.  Any other thoughts??  

Thank you in advance for your help!

Trying to complete the "HUNT YOUR PROSPECT" unit, getting the following error message when i try to complete the creation of the Opportunity:

"Challenge Not yet complete... here's what's wrong: The record was not created correctly"
Unless there are invisible steps in this Trailhead, I have completed them all.
Is it possible this trailhead has an error?