Having trouble with a HEDA field. My lead converts are not functioning i think because of the Preferred Email field provided by HEDA on the contact object. That field does not exist on my leads so when i try to convert the lead into a contact I get the following error.
 
Error: Invalid Data. 
Review all error messages below to correct your data.
Error: Validation error on Contact: The email selected for Preferred Email can't be blank.
 
It seems the field is not removable?
 
How can I get my lead converts to work again?
 
Please help.

I do not have any validations rules in place