When I tried to insert widget on cms page then there was error message el is null.
This is because of a forward slash is missing in lib/Varien/Data/Form/Element/Editor.php on line number 202.
Copy that Editor.php file in app/code/local/Lib/Varien/Data/Form/Element/
Replace following line
'onclick' => "widgetTools.openDialog('" . $this->getConfig('widget_window_url') . "widget_target_id "
To
'onclick' => "widgetTools.openDialog('" . $this->getConfig('widget_window_url') . "widget_target_id/"
After this change you can insert widget in cms.
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