Fatal Error

[lichtjager]

I got this Fatal Error:
Fatal error: Call to a member function cellExists() on a non-object in /mnt/data/www/tools.ib.nl/current/public_html/ibman_tools/includes/PHPExcel/Calculation.php on line 3327
And it could be that there is something wrong with the excel I feed the library but I should never see such a fatal error. You could check at forehand if the object you try to use is infact a object.

[lichtjager]

I figured out it goes wrong when I call this function:
$objPHPExcel->getActiveSheet()->toArray(null,true,true,true);