Sword ability code not working

So, I was trying to make an ability for one of my weapons by following a simple tutorial, but I encountered a problems being that "The wait node isn't supported by the selected generator and will be ignored" (Which is wrong cus when I tried to save an error popped up asking me to re-build the code or ignore the error). It's kinda bad for me because this mean I can't add a cooldown to my ability.

Can someone help me with that ?