fix

booking.emails.inc

@@ -6,6 +6,7 @@ function booking_manual_email($preselected = NULL)
 	//see http://www.jaypan.com/blog/themeing-drupal-7-forms-tables-checkboxes-or-radios	
 	$form = array();	
 	$options = array();
+	$values = array();
 	$group_text = "";
 	$prefix = t("<p>Send a manual email to people registered for this event.</p>");
 	$email_options_array = array();