Question me no understand this error : MissingReferenceException: The variable player of Enemie doesn't exist

i tried making a script to spawn a enemie using prefabs and instantiate gameobject and it has a "player" variable so that the enemie can follow the player and i cant add the player to the variable when it is public
or can i maybe preset the transform variable like you can with ints or bools
public int sda;
and preseting is doing
public int sda = 5;
so maybe if you can do that with transform variables pls tell me pleaaaase