DHTMLX 3.6 grid.setColumnIds()... grid.load(url, "xmlB");

I get DHTMLX 3.6.
and follow this instruction(docs.dhtmlx.com/doku.php?id=dhtm … _templates).

– code ------------------------------------------
grid.setColumnIds(“first,second,third”);
grid.load(url,“xmlB”);

– error ------------------------------------------------------------
Uncaught ReferenceError: ag is not defined dhtmlxgrid_data.js:10
dhtmlXGridObject._process_xmlB dhtmlxgrid_data.js:10
xmlLoader.onloadAction dhtmlxgrid.js:135
check

How do I solve this problem?

Unfortunately the issue cannot be reproduced locally.
Please, provide with a more detailed sample of your code or a complete demo, where the issue can be reconstructed locally.