Joomla 2.5.11 Menu Item Error 500

Hi Experts,

Can you please help point me in the right direction. I can't seem to find anything on any forums that would help resolve the error I'm experiencing with my Joomla website.

When I click on the the menu items its giving me the following errors as show below:


My php_error_log:

[13-May-2013 13:33:11 UTC] PHP Warning:  mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given in C:\xampp\htdocs\Joomla\libraries\joomla\database\database\mysqli.php on line 263
[13-May-2013 13:33:11 UTC] PHP Stack trace:
[13-May-2013 13:33:11 UTC] PHP   1. {main}() C:\xampp\htdocs\Joomla\administrator\index.php:0
[13-May-2013 13:33:11 UTC] PHP   2. JAdministrator->dispatch() C:\xampp\htdocs\Joomla\administrator\index.php:46
[13-May-2013 13:33:11 UTC] PHP   3. JComponentHelper::renderComponent() C:\xampp\htdocs\Joomla\administrator\includes\application.php:153
[13-May-2013 13:33:11 UTC] PHP   4. JComponentHelper::executeComponent() C:\xampp\htdocs\Joomla\libraries\joomla\application\component\helper.php:351
[13-May-2013 13:33:11 UTC] PHP   5. require_once() C:\xampp\htdocs\Joomla\libraries\joomla\application\component\helper.php:383
[13-May-2013 13:33:11 UTC] PHP   6. JController->execute() C:\xampp\htdocs\Joomla\administrator\components\com_menus\menus.php:18
[13-May-2013 13:33:11 UTC] PHP   7. MenusController->display() C:\xampp\htdocs\Joomla\libraries\joomla\application\component\controller.php:761
[13-May-2013 13:33:11 UTC] PHP   8. JController->display() C:\xampp\htdocs\Joomla\administrator\components\com_menus\controller.php:58
[13-May-2013 13:33:11 UTC] PHP   9. MenusViewItems->display() C:\xampp\htdocs\Joomla\libraries\joomla\application\component\controller.php:722
[13-May-2013 13:33:11 UTC] PHP  10. JView->get() C:\xampp\htdocs\Joomla\administrator\components\com_menus\views\items\view.html.php:35
[13-May-2013 13:33:11 UTC] PHP  11. JModelList->getPagination() C:\xampp\htdocs\Joomla\libraries\joomla\application\component\view.php:386
[13-May-2013 13:33:11 UTC] PHP  12. JModelList->getTotal() C:\xampp\htdocs\Joomla\libraries\joomla\application\component\modellist.php:179
[13-May-2013 13:33:11 UTC] PHP  13. JModel->_getListCount() C:\xampp\htdocs\Joomla\libraries\joomla\application\component\modellist.php:231
[13-May-2013 13:33:11 UTC] PHP  14. JDatabaseMySQLi->getNumRows() C:\xampp\htdocs\Joomla\libraries\joomla\application\component\model.php:320
[13-May-2013 13:33:11 UTC] PHP  15. mysqli_num_rows() C:\xampp\htdocs\Joomla\libraries\joomla\database\database\mysqli.php:263

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Your help are much appreciated.

Many thanks in advance
Ricky