PHP Error message Fatal error: Call to undefined method DB_Error::numRows()?

[retlav]

I am getting this error message... can anyone please help... please


Fatal error: Call to undefined method DB_Error::numRows() in file.php on line 173


$queryx = "SELECT * FROM students WHERE year = $year ORDER BY ".$_SESSION['sort'];

$result = $database->query($queryx);

Line 173 => for ($i=0; $i<$result->numRows(); $i++) {

$courses = $result->fetchRow(DB_FETCHMODE_ASSOC,$i);