13:14:07 Create new PHPExcel object<br />13:14:07 Set document properties<br />13:14:07 Add data<br />13:14:07 Set data validation<br />13:14:07 Write to Excel5 format<br /><br />
<b>Fatal error</b>:  Uncaught TypeError: Unsupported operand types: string &lt;&lt; int in /home/adler/www/test/Classes/PHPExcel/Writer/Excel5/Worksheet.php:2840
Stack trace:
#0 /home/adler/www/test/Classes/PHPExcel/Writer/Excel5/Worksheet.php(495): PHPExcel_Writer_Excel5_Worksheet-&gt;writeDataValidity()
#1 /home/adler/www/test/Classes/PHPExcel/Writer/Excel5.php(175): PHPExcel_Writer_Excel5_Worksheet-&gt;close()
#2 /home/adler/www/test/Examples/15datavalidation-xls.php(140): PHPExcel_Writer_Excel5-&gt;save()
#3 {main}
  thrown in <b>/home/adler/www/test/Classes/PHPExcel/Writer/Excel5/Worksheet.php</b> on line <b>2840</b><br />