enemys are killing me in one hit and the health bar is not working plus i am getting a new error a bunch and its confusing me and i have no clue whats going on

i am following this tutorial Wave Based Survival - Player Health Bar | Unreal Engine Tutorial Series

and i have been following the series but for some reason some of the stuff in his player are in my player controller and it doesn’t work when i try to move the stuff so i have been trying to do them in both kind of and now i am trying to do the health bar and the health bar wont update like it just stays grey and the enemy’s kill me i one hit also i keep getting this error

Blueprint Runtime Error: “Attempted to access BP_ThirdPersonCharacter_C_0 via property BP Third Person Character, but BP_ThirdPersonCharacter_C_0 is not valid (pending kill or garbage)”. Node: Return Node Graph: GetHealthBarProgress Function: Get Health Bar Progress Blueprint: WBP_PlayerHUD

and i am so confused below are photos of my blueprints

if anyone can help my i will be so greatfull

anyone got suggestions

@MostHost_LA