distinct error in VBO

I can't reduce duplicates in views and when I try to activate Distinct function I get following error:

# user warning: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DISTINCT(node.nid), users.name AS users_name, users.uid AS users_uid, u' at line 1 query: SELECT COUNT(*) FROM (SELECT DISTINCT(node.nid) AS DISTINCT(node.nid), users.name AS users_name, users.uid AS users_uid, users.mail AS users_mail FROM node node LEFT JOIN users_roles users_roles_value_0 ON node.uid = users_roles_value_0.uid AND users_roles_value_0.rid = 7 INNER JOIN users users ON node.uid = users.uid WHERE users_roles_value_0.rid = 7 ORDER BY users_name ASC ) count_alias in /web/htdocs/www.snowpedia.it/home/sites/all/modules/views/includes/view.inc on line 705.
# user warning: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DISTINCT(node.nid), users.name AS users_name, users.uid AS users_uid, u' at line 1 query: SELECT DISTINCT(node.nid) AS DISTINCT(node.nid), users.name AS users_name, users.uid AS users_uid, users.mail AS users_mail FROM node node LEFT JOIN users_roles users_roles_value_0 ON node.uid = users_roles_value_0.uid AND users_roles_value_0.rid = 7 INNER JOIN users users ON node.uid = users.uid WHERE users_roles_value_0.rid = 7 ORDER BY users_name ASC LIMIT 0, 100 in /web/htdocs/www.snowpedia.it/home/sites/all/modules/views/includes/view.inc on line 731

I've also tryed to patch with this but no lucky:

Index: sms_user.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/smsframework/modules/sms_user/sms_user.module,v
retrieving revision 1.8
diff -u -p -r1.8 sms_user.module
--- sms_user.module	5 Sep 2008 20:33:59 -0000	1.8
+++ sms_user.module	30 Sep 2008 17:17:14 -0000
@@ -133,10 +133,14 @@ function sms_user_settings_add_form_subm
 }
 
 function sms_user_settings_confirm_form(&$form_state, $account) {
+  $value = $account->sms_user[0]['number'];
+  if (isset($account->sms_user[0]['gateway']['country'])) {
+    $value = '+' . $account->sms_user[0]['gateway']['country'] . $value;
+  }
   $form['number'] = array(
     '#type' => 'item',
     '#title' => t('Number'),
-    '#value' => $account->sms_user[0]['number'],
+    '#value' => $value,
   );
   $form['confirm_code'] = array(
     '#type' => 'textfield',
@@ -182,10 +186,14 @@ function sms_user_settings_confirm_form_
 }
 
 function sms_user_settings_reset_form(&$form_state, $account) {
+  $value = $account->sms_user[0]['number'];
+  if (isset($account->sms_user[0]['gateway']['country'])) {
+    $value = '+' . $account->sms_user[0]['gateway']['country'] . $value;
+  }  
   $form['sms_user']['number'] = array(
     '#type' => 'item',
     '#title' => t('Your number'),
-    '#value' => $account->sms_user[0]['number'],
+    '#value' => $value,
     '#description' => t('Your number has been confirmed.')
   );
   
@@ -527,4 +535,4 @@ function sms_user_sms_receive(&$node, $s
   $account = user_load(array('uid' => $uid));
   $node->uid = $account->uid;
   $node->name = $account->name;
-}
\ No newline at end of file
+}