PHPExcel: Undefined offset with particular file

Hi Experts,

I'm trying to load the attached Excel file using PHPExcel, but as soon as I do, I get:

Notice: Undefined offset: 8 in C:\inetpub\wwwroot\CSS_Reservations\excel_lib\PHPExcel\Reader\Excel5.php on line 5873

Notice: Undefined offset: 7 in C:\inetpub\wwwroot\CSS_Reservations\excel_lib\PHPExcel\Reader\Excel5.php on line 5873

Notice: Undefined offset: 7 in C:\inetpub\wwwroot\CSS_Reservations\excel_lib\PHPExcel\Reader\Excel5.php on line 5873

Notice: Undefined offset: 6 in C:\inetpub\wwwroot\CSS_Reservations\excel_lib\PHPExcel\Reader\Excel5.php on line 5873

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My code thus far is

        global $env;
        //copy template file
       
            //Temporarily Change directory to root to copy files...
            $currentDIR = getcwd();
            chdir("../../");
            $rootDIR = getcwd();
            //Change DIR back
            chdir($currentDIR);
            
        $slash = DIRECTORY_SEPARATOR;

        //echo 'dir = ' . $currentDIR . '<br>';
        
        
        $file_name = "NiagaraPAXreport_" . $_SESSION['sess_id'] . ".xls";
        
        $file_from = $rootDIR . $slash . "reports" . $slash . "niagara_pax"
                                    . $slash . "NiagaraPAXreport_template.xls";
        
        $file_physical = $rootDIR . $slash . "downloads" . $slash . $file_name;        
        $file_virtual = $env['url'] . '/downloads/' . $file_name;        
        $copy_success = copy($file_from, $file_physical);          
        
        //Define From / To Dates as objects        
        $date_from = new DateTime($from);
        $date_to = new DateTime($to);
        
        /** Include PHPExcel **/
        error_reporting(E_ALL);
        set_time_limit(0);
                
        $fileType = 'Excel5';
        
        require_once '../../excel_lib/PHPExcel/IOFactory.php';
        
        // Read the file
        $excelReaderObj = PHPExcel_IOFactory::createReader($fileType);
        $excel_obj = $excelReaderObj->load($file_physical);

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The error goes away if I comment out the last line, but I need that in order to be able to work with the file.

Additionally, I'm using this same code in another module with another file, and it works.  I also went into that module, swapped that file with the attached, it stopped working (same errors).  

Therefore, something is wrong with the attached file, but what?  I even removed the chart on the second sheet - the error persist.

Any help will be greatly appreciated.

Thank you.
NiagaraPAXreport-template.xls