Using ajax on my contact form

On my contact form
http://new.coronadofol.org/new/contact.php
I’m trying to use AJAX to handle the form

<script>
$('#contact_fol').submit(function(e) {
    // prevent form submit
    e.preventDefault();

    formData = new FormData($(this)[0]);
    $.ajax({
		url: 'php/contact_engine.php',
		type: 'POST',
		dataType: 'json',
		data: formData,
		processData: false,
		contentType: false,
		success: function(data)
                {
			if(data.error) {
				// Show errors
				$('#contact_result').html(data.error);
			}
			else if(data.success) {
				// Show success message
				$('#contact_result').html(data.success);
                                //Put here the code to reset the fields of your form
			}
			else {
				window.location.reload();
			}
        },
        error: function(data)
        {
        	// Something went wrong
               $('#contact_result').html('<div class="error"><h4>Error</h4><p>Something went wrong.</p></div>');
        }
	});
});

</script>

When I submit the form


So I’m guessing there is an error somewhere.
But when I check the console, I see no mention of it.
How can I tell?