Creating Array Problem

This is gonna be something simple i know it.

Getting this error when trying to create an array from XML information

[code=html]
Warning: Illegal offset type in C:wampwwwPersonaltoolincxmlmodule.php on line 36

Warning: Illegal offset type in C:wampwwwPersonaltoolincxmlmodule.php on line 36

Warning: Illegal offset type in C:wampwwwPersonaltoolincxmlmodule.php on line 36
[/code]

Array code

[code=php]
function getLocation($xml) {
foreach($xml->result->rowset->row as $value) {
$data[$value->attributes()->numberID] = $value->attributes()->locationID;
}
return $data;
}
[/code]

Any idea why throwing this error out at me

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