"On Target Update Perception" node does not exist

I have used this node countless times and now all of a sudden I cant find it anywhere even if the context box is unchecked. I feel like I am going crazy. I am in the AI controller and it has a perception component and it’s compiled. I tried restarting the editor. I even opened up an older project of mine in UE 4.10 where I used the node before and when I right click and try to search for it magically it is missing from there as well.

Are you at the Construction Script page?)

I have the same issue. Suddenly cannot find the node.

I found it. You have to click on AIPerception, right click on an empty area inside the Blueprint editor, choose Add Event for AIPerception.