Came Across Error When Adding Crosshair

I recently tried adding a crosshair into my game but I’ve ran into a few issues. Whenever I run the level the crosshair is just a large white square, after I stop running the level I run into an error. I’ve been stuck trying to figure the reason for the past 2 days so I decided to come to reddit for help. If anyone knows what’s causing this please give me a reply, thank you.

Don’t know why the screenshot of the error glitched out but hopefully it works this time
Screenshot 2024-11-22 152402