Error still keeps appearing

I’ve been following along Strigifo’s/Rob Brooks’s playlist on how to make this top-down view, scrolling space shooter, and I’m down to the last few videos. https://www.youtube.com/playlist?lis…pFpg58SmiZZVEthttps://www.youtube.com/playlist?lis…pFpg58SmiZZVEt

But I’ve noticed I still keep on getting this error message whenever my player ship interacts with an asteroid in some way.

Blueprint Runtime Error: “Accessed None trying to read property BP_GameMode”. Blueprint: BP_EnemyBase. Function: Enemy Killed. Graph: Enemy Killed. Node: Enemy Killed.
Blueprint Runtime Error: “Accessed None trying to read property BP_GameMode”. Blueprint: BP_EnemyBase. Function: Enemy Killed. Graph: Enemy Killed. Node: Set Score.
Blueprint Runtime Error: “Accessed None trying to read property BP_GameMode”. Blueprint: BP_EnemyBase. Function: Enemy Killed. Graph: Enemy Killed. Node: Play Cam Shake.

Has anyone here actually tried to make this sample space shooter along with Mr. Brooks and his playlist? Did you ever run into any errors similar to this? How were you able to correct it, if you did? I’ve tried everything, even painstakingly going back to where it says the error seems to be. I can never quite pinpoint what or where exactly it is. No matter what I’ve tired thus far, nothing seems to be working and that same error message keeps on displaying whenever I happen to shoot an asteroid or collide with it. Everything else seems to be working just fine except that. I try to follow Rob’s exact demonstrations to the letter also, so I don’t know where else something went wrong.