Sql error 172 in a view who displays an A/B/C list of the node title based on the feed name

Hi, i've tried to set a view that displays a page like an alphabetical directory in A/B/C format that enables to access to all the blogs aggregated in a simplefeed installation and sort it by "name of blog" (feed). So the goal is display in the main page all the A/B/C letters and when you click on one just see all the blogs with this first letter in its name.

If i access to /url/blogs/M (letter M) there are displayed all the blogs with a name or title starting with "M". And this is ok with every letter. ;)

But i i go to "main page" of this directory i've got this error that i can't solve in any way:

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 '(node.title, 1) FROM node node WHERE (node.status = '1') AND (node.type IN ('fe' at line 1 query: SELECT LEFT(node.title, 1) AS letter, count(node.nid) AS num_nodes, node.LEFT(node.title, 1) AS letter_LEFT(node.title, 1) FROM node node WHERE (node.status = '1') AND (node.type IN ('feed')) GROUP BY LEFT(node.title, 1), letter_LEFT(node.title, 1) ORDER BY letter_LEFT(node.title, 1) ASC LIMIT 0, 10 in /home/.joy/user/url.com/drupal/includes/database.mysql.inc on line 172.

And this is the view i created:

 $view = new stdClass();
  $view->name = 'totselsblogs';
  $view->description = 'Llistat alfabètic de tots els blogs';
  $view->access = array (
  0 => '1',
);
  $view->view_args_php = '';
  $view->page = TRUE;
  $view->page_title = 'Blogs per titol';
  $view->page_header = '';
  $view->page_header_format = '1';
  $view->page_footer = '';
  $view->page_footer_format = '1';
  $view->page_empty = '';
  $view->page_empty_format = '1';
  $view->page_type = 'teaser';
  $view->url = 'blogs/tots';
  $view->use_pager = TRUE;
  $view->nodes_per_page = '10';
  $view->menu = TRUE;
  $view->menu_title = 'Tots els blogs';
  $view->menu_tab = FALSE;
  $view->menu_tab_weight = '0';
  $view->menu_tab_default = FALSE;
  $view->menu_tab_default_parent = NULL;
  $view->menu_tab_default_parent_type = 'tab';
  $view->menu_parent_tab_weight = '0';
  $view->menu_parent_title = '';
  $view->sort = array (
    array (
      'tablename' => 'node',
      'field' => 'changed',
      'sortorder' => 'ASC',
      'options' => 'normal',
    ),
  );
  $view->argument = array (
    array (
      'type' => 'nodeletter',
      'argdefault' => '4',
      'title' => '%1',
      'options' => '1',
      'wildcard' => '',
      'wildcard_substitution' => '',
    ),
  );
  $view->field = array (
    array (
      'tablename' => 'node',
      'field' => 'title',
      'label' => '',
      'handler' => 'views_handler_field_nodelink',
      'options' => 'link',
    ),
  );
  $view->filter = array (
    array (
      'tablename' => 'node',
      'field' => 'status',
      'operator' => '=',
      'options' => '',
      'value' => '1',
    ),
    array (
      'tablename' => 'node',
      'field' => 'type',
      'operator' => 'OR',
      'options' => '',
      'value' => array (
  0 => 'feed',
),
    ),
  );
  $view->exposed_filter = array (
  );
  $view->requires = array(node);
  $views[$view->name] = $view;

ANY HELP? Thanks!

May be there are other ways to display thins info and may be the error is because the view is not well done. (i'm using views 5.x1-6 and simplefeed 5.x-1.0)

Waiting a response from you, regards.