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DHTMLXEditor Error

I keep getting an error message in the dhtmlxeditor at this spot.

this._td2.style.height = this.base.offsetHeight-this._tbH+"px"

What would cause this error?

I am init with
var editor = new dhtmlXEditor("editorObj");
editor.setIconsPath("dhtmlx/imgs/");
editor.init();

and here is the div
<div id="editorObj" style="width: 100%; height: 300px"></div>

I also included all the js and css files.