copy and cut features of edit plugin of richtexteditor are not working

 Hi,

I have followed http://dev.day.com/docs/en/cq/current/administering/configuring_rich_text_editor.html and configured copy and cut features to "edit" plugin. Whenever I clicked on copy/cut tools after selecting some text, I'm getting the following error in browser console -

TypeError: this.editorKernel is undefined
    
else if (e.message == "Cannot copy.") {
this.editorKernel.getDialogManager().alert(
CUI.rte.Utils.i18n("Copy"),
CUI.rte.Utils.i18n("Could not copy due to security restrictions of the browser.<br>Please use Ctrl+C to copy directly."),
CUI.rte.Utils.scope(this.deferFocus, this));
}

I tried to pasted it but it is not getting pasted the selected text. Is it browser related issue or something else? Please help me in this. Your comments are welcome. I'm using Adobe Experience Manager (5.6.1.20130606).

Thanks,

Arya.