Looking for Expert API Developer to Fix Error Response on Wordpress Site

Looking to fix this ASAP! We have an API working on a different site and we tried to transfer everything over to a new site and get the same API working. We think its properly setup, but we are getting an error page. Our site is built in wordpress, and what the API is doing is checking a user entered address and telling the user what packages are available at their address. The API will return 1 of 4 options based on the address. To see the issue, and to see if you think you can fix it, please go to this page [login to view URL] and enter any US address in the FIRST field. "Find Available Packages In Your Area [Street Address] You should then see the error. Thanks!