Is not a good practice to use views of another controller.
If you have some content that you have to display more than once, create a widget.
About the second method, there is a typo, the slash is not needed.
You have to understand that code that people post in the forum can be affected by typos or mistake. Before posting agint try to do some debug or to read the documentation of the method renderPartial, all answer are here.
Pay attention that have a fame of user "fast on the button - " can prevent many user to post for help you in future.