If I take the : out from the arguments, leaving it as /case/objectName/filterId, it accepts and creates the menu Item, but when I click on it, It takes to the error page. Any Ideas on how to work that out? Best Regards.
You need to replace the ":objectName" and the ":filterId" with the desired parameter values. Your URL should then look like this: /case/Case/[ListviewId]
An example: The ListviewId you can find within your salesforce URL when you load a listview created in your ORG:
Hope this helps.