Blueprint Runtime Error: "Accessed None trying to read property Enemy"

[FONT=Comic Sans MS]Hi, I’m new to unreal engine, and I’m trying out a beginner top-down wave shooter. Some of the code I made to set up a wave system and ai spawning is not functioning, and I get the error code that is in the title. I’ll link the code if anyone wants to take a look at it. I’ve been troubleshooting forever and I’m just so confused. Thank you in advance. I’d really appreciate some help soon as I’m almost done with the project and I’m trying to finish before the due date in 3 days. The full error code is Blueprint Runtime Error: “Accessed None trying to read property Enemy”. Blueprint: BP_AIManager Function: Enemies Spawned Graph: EnemiesSpawned Node: Bind Event to On Killed