How can I call a fuction in behavior tree's task

So I was following this tutorial Unreal Engine 4: RTS :: Ep22 - AI Does Construction - YouTube and tried to copy what he did and got access none trying to read property… error when I try to call ‘Report To Shift’ function from 20:07. Did something chaneged in those 2 years and you can no longer do that or am I just stupid and copied something wrong?

First, it is going to be very hard to tell what YOU did wrong without any screen shots of what your setup looks like. Second, no nothing should have changed to give you that error. Accessed none means you are using a variable that was never set prior to use and thus has no data. Post screen shots of your setup and the specific error (what is “accessing none”) and we will go from there.