so I am using 4.6 unity and I am trying to get perfect or near perfect controller support for my UI. One thing I came across was the “First Selected” on the event system. Now, currently that is only allowing me to do it with one option from my UI. I would like more options as I have a pause, options and quit canvas’s so when I open each, it requires my mouse to be moved in order to get the controller working on each. This defeats the purpose of using the controller. Is there anyway to attach a First Selected on each canvas and if so how?
While this IS two years old, I had the same issue, with the same error message. Here is what worked for me:
Instead of adding a EventSystem Gameobject add it the EventSystem as a component to each of your panels. You can add the first selected menu item then.