It shows me the “warning” but it works very well, I do not see any error, my query would be…It is serious or are details that will not affect me in the future, I clarify the blueprint works correctly
Hover over that warning and tell us what it says
As a general rule you don’t want to perform any kind of calculation within your anim graph, keep it all in the event graph. See Animation Fast Path Optimization | Unreal Engine Documentation.
To get that warning to go away perform the same calculation in the event graph and promote it to a variable then plug that variable into start position. Just make sure you don’t calculate it on update animation otherwise it will cause issues.
Excellent!! I will do that, thanks for this answer, now I have it clear, a lot of thanks 
you have helped me