WordPress & PHP Error Troubleshooting

We have a WordPress site running ListingPro that as of the last WordPress update, broke the site. In order to get the site looking fine to the public, we rolled the site and updates back. That way you and the public see a working site... (Budget: min $50 USD, Jobs: HTML, MySQL, PHP, Troubleshooting, Web Development, Website Development, Website Optimization, WordPress, WordPress Design, WordPress Plugin)