Explain why the following line causes an error in Unity(C#)?

Question

C++ / C#

Explain plz. why does the following line cause an error in Unity:

scene_controll = gameObject.Find("Big_enemy").GetComponent<SceneController>();

Here is the error:
Assets\ReactiveTarget.cs(21,26): error CS0176: Member 'GameObject.Find(string)' cannot be accessed with an instance reference;

qualify it with a type name instead

• All necessary components and methods with the public modifier
  
• The "scene_controll" object is declared at the beginning of the class:
  SceneController scene_controll;
  
• An object named "Big_enemy" exists in the scene
  
• I also tried to write it like this:
  

  scene_controll = gameObject.Find("Big_enemy").GetComponent("SceneController");

  
  

Answer 1

scene_controll = GameObject.Find("Big_enemy").GetComponent<SceneController>();