I am having a similar problem, except I get the error in Firefox only and not Internet Explorer.

 

I had tried using the code above and I still get the error. I know it is something wrong on my send somewhere, I just have no idea what I am looking for. Can you give me some guidance. Basically it loads the tool bar but does not load the drop downs, such as fonts, etc and the editor and Normal/HTML tabs do not work. No content is displayed in the editor either. Any ideas on what I can check?