From your second image, it seems like your custom event is called “Custom Event” instead of “Open Door”. You can either click on your custom event and hit F2 on your keyboard to rename it, or search for “Custom Event” after dragging out of the As BP Door pin.
That’s because you’re drawing your line traces! Don’t worry they’re only visible inside the editor, and won’t appear in the packaged game even if you leave it as it is. However, if you want to stop the visualization of the traces, you can simply select the Draw Debug Type option inside your Line Trace by Channel node as none