New Post: error : Sheet index is out of bounds

That makes sense, but that's not what's happening here. PHPExcel fails while loading.

I am using this code and it fails right when trying to load.

$objReader->setLoadSheetsOnly( array("Sales Dashboard") );
$objPHPExcel = $objReader->load($filename);  <-- failure
$objWorksheet = $objPHPExcel->getSheetByName("Sales Dashboard");

The 'PHPExcel->getSheet('9')' in the exception is something internal to the load() function.