I get an error trying to use a Blueprint prop to display the HUD

Hi i am getting this error when following this tutorial for displaying HUD text.

Error Cannot override ‘ShowHUD_C::ShowHUD’ at Event Show HUD which was declared in a parent with a different signature

The only difference is im using a class blueprint not a level blueprint.
I get the error on the last step, adding the blueprint prop ShowHud.
What im trying to do is have a message pop up on screen when you get close to a weapon on the ground that says “Hold X to equip”.
Please help