PDO in query genera errore warning

[rocco.mod]

ciao sono parecchi errori , momentaneamente mi da questo Fatal error: Call to a member function fetch() on a non-object in C:\Program Files\EasyPHP-DevServer-14.1VC11\data\localweb\cms\class\dbclass.php on line 84

function getquery($sql)
{
$result = $this->query($sql);
$returned = $result->fetch(PDO::FETCH_ASSOC);
/* $result->closeCursor(); */
return $returned;
}