Setting a Variable from another Blueprint

[Leo_kill7 (Yakoto)]

I got a Player who shoots a bullet and i want to set a variable in the bullets Blueprint after spawning it that holds the players player controller. Every time i spawn a bullet i get two error messages, as displayed in the screenshot. Any ideas how to solve this error message?

[Everynone]

Did you mean to:

---

Do note that you can:

So the bullet can:

Without creating additional variables.

[Leo_kill7 (Yakoto)]

Thanks, helped a lot