17:27:45 Create new PHPExcel object<br />17:27:45 Set properties<br />
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<b>Notice</b>:  Undefined index: classroom in <b>/var/www/clients/client0/web1/web/schoolv1/PHPExcel/Examples/variable.php</b> on line <b>167</b><br />
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<b>Notice</b>:  Undefined index: classroom in <b>/var/www/clients/client0/web1/web/schoolv1/PHPExcel/Examples/variable.php</b> on line <b>213</b><br />
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<b>Fatal error</b>:  Uncaught PHPExcel_Exception: Invalid character found in sheet title in /var/www/clients/client0/web1/web/schoolv1/PHPExcel/Classes/PHPExcel/Worksheet.php:467
Stack trace:
#0 /var/www/clients/client0/web1/web/schoolv1/PHPExcel/Classes/PHPExcel/Worksheet.php(841): PHPExcel_Worksheet::_checkSheetTitle(NULL)
#1 /var/www/clients/client0/web1/web/schoolv1/PHPExcel/Examples/variable.php(213): PHPExcel_Worksheet-&gt;setTitle(NULL)
#2 {main}
  thrown in <b>/var/www/clients/client0/web1/web/schoolv1/PHPExcel/Classes/PHPExcel/Worksheet.php</b> on line <b>467</b><br />