Problem setting cell borders

[jzieba01]

I am having a problem trying to apply borders to cells. I get the following error message:

"Fatal error: Uncaught Error: Class 'Border' not found in ..."

$styleArray = array( 'borders' => array( 'allborders' => array( 'borderStyle' => Border::BORDER_MEDIUM, 'color' => array('argb' => '000000'), ), ), ); $activeSheet->getStyle('A2:J15')->applyFromArray($styleArray);
Any idea on how to fix this? This is pretty much straight from the docs.

[MarkBaker]

The Border class is namespaced in PhpOffice\PhpSpreadsheet\Style.

Do you have a use PhpOffice\PhpSpreadsheet\Style\Border; at the top of your script? Otherwise use a FQDN.