Problem with Domain Reselling in Domain Mapping

I'm trying to get the domain reseller feature set up in the Domain Mapping plugin. I'm using Enom. I finally got everything set up where I'm not getting any errors from Enom. They've added my IP address and everything. So I tried the process of checking domain availability and that worked fine. When I tried to purchase it, it just takes me to a blank white page with only this text on it:

Are you sure you want to do this?
Please try again.

The URL of the page is:

The link for "Please try again" is:

I have attached a screenshot of the reseller API log. Everything is showing green with no errors.

Please help!