Could not successfully run wp_mail function

I get this message when trying to submit this form”

“Error occurred while sending the message: Could not successfully run wp_mail function. There may be a warning in the PHP error log with more information.”

Any idea what could be causing this?

Here is a link to a screenshot: https://www.dropbox.com/s/9gbct1tyq19s0nx/Application%20Error.jpg?dl=0

The page I need help with: [log in to see the link]