#37 Fatal error: Call to a member function get_id() on a non-obj

[Anonymous]

This code:

require_once( "pdf/dompdf_config.inc.php" );
$pdf = new DOMPDF( );
$pdf -> load_html_file( "userfiles/$loginid.php" );
$pdf -> render( );
$pdf -> stream( "Report Export.pdf" );

Produces these errors:

Notice: Undefined offset: 13 in D:\Documents\webpages\Kinetrics\portal\pdf\include\cellmap.cls.php on line 559

Fatal error: Call to a member function get_id() on a non-object in D:\Documents\webpages\Kinetrics\portal\pdf\include\cellmap.cls.php on line 560