Hi,
please show us some code of what you’re doing
You can use this snippet to prepare a demo docs.dhtmlx.com/gantt/snippet/9ed2c415
add needed code and press “Share” button to generate a link to the sample
Gantt must calculate column templates during export. Also, if you need to have a different kind of output for export, you can use a switch in the template, like follows
template:function(task){
if (gantt.exportMode) return "data for export";
return "data for normal rendering";
}
Problem can occurs if you are using very old version of the Gantt ( 2.x )
In this case you could try to redefine gantt columns to one that you want to export and then set it back.
For example: docs.dhtmlx.com/gantt/snippet/2a99d318