Can't activate event in HUD BP from player BP

I have been trying to get this to work for several hours now and I’m completely stumped even after perusing many forums and videos.

I have a raycast coming from my player that I want to call an event in my hud when it hits the desired object.
The problem is, it just won’t call the event, and I know it should work because a string will print just fine when the raycast is hit. Here is my player BP and Hud BP.

When the raycast is successful, it should set the boolean, CrosshairNumber, to true in the HUD and to false if it fails. Right now, nothing happens.
Also, at runtime I get the error, Accessed none trying to read property hudTarget from function: ‘ExecuteUbergraph_playerCamera’ from node: setCrosshair1 in graph eventgraph in object playerCamera