Error:Fatal error: Call to a member function add_student() on a non-object in /var/www/21centdata.com/htdocs/v2_06/report_meeting_goal.php on line 45

I'm getting an error on the $student value below, I'm assuming it's because the value is empty... I'm I getting warming?

I appreciate any responses, I spend most of my day munging Coldfusion...

function &get_results($YEAR, $last_day, $target, $site_id, $mysql, $site_name){
$site =& new Site($site_name, 'Site');;
$students = get_students($YEAR, $last_day, $target, $site_id, $mysql);
add_grades($site, $YEAR, $site_id,$mysql);

foreach($students as $student){
if($student->site == $site_name){
$site->complete_grades[$student->grade]->add_student($student);// This is the line throwing the error...
}
}
propagate_aggregates($site);
return $site;
}

It means that

PHP Code:

$site->complete_grades[$student->grade] 


is not an object.

It could be becouse of:
a) there is no key $student->grade in array $site->complete_grades or it is not an object
b) $site->complete_grades is not an array

Try to var_dump your variables to find out your bug.