php - Fatal Error: Uncaught exception 'PDOException'

I downloaded this website directory and when I ran it, I received the following error:

ERROR
Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[42S02]: Base table or view not found: 1146 Table 'u471047401_test.Categories' doesn't exist' in /home/u471047401/public_html/inc/blocks/sidebar.php:13 Stack trace: #0 /home/u471047401/public_html/inc/blocks/sidebar.php(13): PDOStatement->execute(Array) #1 /home/u471047401/public_html/index.php(6): require('/home/u47104740...') #2 {main} thrown in /home/u471047401/public_html/inc/blocks/sidebar.php on line 13

    $cat = $_GET['cat'];
if(empty($cat))
{
    $cat = 0;
}
$menu_query = ("
    SELECT cat_id, cat_name, parent_cat
    FROM Categories

    WHERE (cat_id = ? OR parent_cat = ?)");

$stm = $conn->prepare($menu_query);
$stm->execute(array($cat, $cat));
("u471047401_test.Categories");
$categories = $stm->fetchAll();

?>

    


foreach($categories as $categories_row)
{
    $act = $categories_row['cat_id'] == $cat ? 'active' : '';
    echo"
    

        
        {$categories_row['cat_name']}
         
      
";


    if($categories_row['cat_id'] == $cat && $categories_row['cat_id'] > 0)
    {
    $back_link = "
Back
";
    }
}
?>  
    
    

What is causing this error?