18:11:34 Create new PHPExcel object<br />18:11:34 Set document properties<br />18:11:34 Generate an image<br /><br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function imagecreatetruecolor() in /var/www/php7.0/vendor_bts/phpoffice/phpexcel/Examples/25inmemoryimage.php:57
Stack trace:
#0 {main}
  thrown in <b>/var/www/php7.0/vendor_bts/phpoffice/phpexcel/Examples/25inmemoryimage.php</b> on line <b>57</b><br />