diff --git modules/user_reference/user_reference.module modules/user_reference/user_reference.module
index 81bcd74..18b99b2 100644
--- modules/user_reference/user_reference.module
+++ modules/user_reference/user_reference.module
@@ -373,7 +373,7 @@ function user_reference_field_widget(&$form, &$form_state, $field, $instance, $l
 /**
  * Implementation of hook_field_widget_error().
  */
-function nodereference_field_widget_error($element, $error) {
+function user_reference_field_widget_error($element, $error) {
   form_error($element['uid'], $error['message']);
 }