[Plugin: Contact Form 7] wpcf7_validate_text is working but 'reason' text is coming blank.

Hi,

I have added this filter on wpcf7_validate_text, It works well but unable to show any text, it shows just blank text box next to the field and result-box with standard validation error.

// Add custom validation for CF7 form fields
function custom_text_validation_filter($result,$tag){
	$type = $tag['type'];
	$name = $tag['name'];
	if($name == 'page_url'){ // Only apply to fields with the form field name of "page_url"
		$the_value = $_POST[$name];
		if($the_value !== 'www.google.com'){ // Sample test.
			$result['valid'] = false;
			$result['reason'][$name] = 'This facebook page doesn\'t exist.';
		}
	}
	return $result;
}
add_filter( 'wpcf7_validate_text', 'custom_text_validation_filter', 10, 2 ); // text field
add_filter( 'wpcf7_validate_text*', 'custom_text_validation_filter', 10, 2 ); //Req. text field.

http://wordpress.org/extend/plugins/contact-form-7/