Joomla 3.3.6 - Notice: Undefined index: view...

Joomla 3.3.6 - Notice: Undefined index: view in /home/public_html/components/com_content/router.php on line 70

Possible cause (1): If you change a menu entry of type "Single post" to type "Menu alias", this error occurs.

Solution: Delete the menu item (waste basket) when it is no longer needed and then create it again with the desired type.