WordPress (Windows Server) Expert Needed to Resolve Customizer Errors

I need a senior freelancer who is highly proficient in WordPress themes/plugins and highly proficient with Windows Server (IIS, FastCGI, PHP on Windows—not Linux). A newly installed theme is largely working, but the Customizer throws repeated warnings at the top of the page… (Budget: $30 – $250 USD, Jobs: Debugging, Documentation, HTML, IIS, MySQL, Performance Tuning, PHP, Regression Testing, Windows Server, WordPress)