Object Reference not set to an instance of Object

Question

Good evening, I’m trying to take a function that be in another script and pass it to a button, only to be giving this error that be in the title.

int indice;
public Button Ant;
public ScriptName Script;

void Start() {
    call();
}

void call() {
    if (indice <= 0) { indice = 0; }

    if (indice >= 1) {
        indice = 1;
    }

    if (indice == 0)
    {
        Ant.GetComponent<ScriptName>().anteriorobj();//assim não funciona
        Ant.GetComponent<Script>().anteriorobj();//assim tambem não funcioa
    }
    else if (indice == 1)
    {
    //blablabla
    }
}

public class ScriptName : MonoBehaviour {
    public void anteriorobj()
    {
        Debug.Log("Active");
    }

Answer 1

You can simply create a property in the class you want to use the class ScriptName

example:

public ScriptName script;

and access like this:

script.anteriorobj();

remembering that you have to drag the ScriptName for the property at the inspector

Answer 2

• The variable Ant must be assigned in the Inspector.
• The Gameobject referenced in the previous variable (Ant) must have the ScriptName.

If any reference is missing it will give the error mentioned.