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DhtmlXtreeGrid

I am tring to display DhtmXTreeGrid by including the 'dhtmlXTreeGrid.js' file and setting the 'myGrid.setColTypes(tree,ed,ed)'.
But it's giving me the error 'this.obj.firstChild is null'. pls advice

Please provide any kind of sample where we can reproduce this issue. You can find working example of dhtmlxTreeGrid at your dhtmlxTreeGrid package dhtmlxTreeGrid\samples\initialization_loading\treeGrid_init.html