Why am I not able to drag a script into another script's Game Manager anymore?

Questions & Answers
1

I have been following along with a YouTuber’s tutorials (Brackeys) and have come upon a snag.
I am not able to drag and drop my script (GameManager) into the Game Manager of one of my other scripts (End Trigger). This is for my Level 2 scene, I was able to do this before with my Level 1 scene.

I am sorry if this is not detailed enough, I just started two days ago and know little coding.

2

I’m not sure what happened, but you can make sure your GameManager class name is equal to your c# file name. And make sure your GameManager class Inherits from MonoBehaviour.
If you still have that problem, you should show me your script.