laravel-phpexcel，getCalculatedValue（）返回int 0

I'v been struggling for days now with this issue. I have an xls file, containing multiple sheets, with functions on it. What i'm trying to do is to insert values at the first sheet, and then retrieve the result from the second one, but the result i'm getting is 0.

This is the code i'v written

    $fileType = 'Excel5';
    $fileName = storage_path().'/penssion_simulator_file/test2.xls';

    // Read the file
    $objReader = PHPExcel_IOFactory::createReader($fileType);
    $objReader->setReadDataOnly(true);

    echo "Start loading file:</br>";
    echo date('H:i:s d/m/Y')."</br>";
    $objPHPExcel = $objReader->load($fileName);
    echo "End of loading file:</br>";
    echo date('H:i:s d/m/Y')."</br>";

    PHPExcel_Calculation::getInstance($objPHPExcel)->disableCalculationCache();
    PHPExcel_Calculation::getInstance($objPHPExcel)->clearCalculationCache();

    echo "Start setting values to file:</br>";
    echo date('H:i:s d/m/Y')."</br>";
    $objPHPExcel->setActiveSheetIndex(0)
        ->setCellValue('B7', (string)date('d/m/Y'))
        ->setCellValue('B8', (string)'30/05/1984')
        ->setCellValue('B9', (string)'01/05/2013')
        ->setCellValue('B10', (integer)20000)
        ->setCellValue('B11', (string)'ללא בן זוג וילדים (לצורכי ביטוח)')
        ->setCellValue('B12', (float)5.5)
        ->setCellValue('B13', (float)6.0)
        ->setCellValue('B14', (float)8.33)
        ->setCellValue('B15', '-')
        ->setCellValue('B16', (string)'גבר')
        ->setCellValue('B17', (integer)0)
        ->setCellValue('B18', (integer)0)
        ->setCellValue('B19', (string)'עתיר חיסכון')
        ->setCellValue('B20', (float)6.0)
        ->setCellValue('B21', (float)0.25)
        ->setCellValue('B22', (integer)67)
        ->setCellValue('B23', (string)'כן')
        ->setCellValue('B24', (string)'לא');

    echo "End of setting values to file:</br>";
    echo date('H:i:s d/m/Y')."</br>";

    $objWorksheet = $objPHPExcel->setActiveSheetIndex(1);
    echo "Value of cell B6 on sheet 1: ".($objWorksheet->getCell('B6')->getCalculatedValue())."</br>";

    // $value = $this->getCellValue($objWorksheet,'B3');

    // echo "</br>This is the value og cell B3: ".$value."</br>";

    // PHPExcel_Calculation::getInstance()->writeDebugLog = true;
    // $this->testFormula($objWorksheet,'B3');

    $objWorksheet = $objPHPExcel->setActiveSheetIndex(0);


    echo "Value of cell B7 on sheet 0: ".($objPHPExcel->getActiveSheet()->getCell('B7')->getValue())."</br>";




    echo date('H:i:s d/m/Y')."</br>";
    // Change the file
    die('FIN');

And those are the outputs that i'm printing:

Start loading file: 09:03:27 28/01/2015. End of loading file: 09:04:26 28/01/2015. Start setting values to file: 09:04:26 28/01/2015. End of setting values to file: 09:04:26 28/01/2015 Value of cell B6 on sheet 1: 0 Value of cell B7 on sheet 0: 28/01/2015 09:04:30 28/01/2015 FIN

I'm using laravel as i mentioned at the header of this post, and the laravel-phpexcel package.

Appreciate your help!