So how do I fix Count error?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class Scriptsphere : MonoBehaviour{
private Rigidbody rb;
private int count;
public Text countText;

void Start()
{
	rb = GetComponent<Rigidbody> ();
	count = 0;
	setCountText ();
}

void FixedUpdate()
{
	float moveHorizontal = Input.GetAxis ("Horizontal");
	float moveVertical = Input.GetAxis ("Vertical");

	Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);

	rb.AddForce (movement);

}
void OnTriggerEnter(Collider other) 
{
	if (other.gameObject.CompareTag ("pickup")) {
		other.gameObject.SetActive (false);
		count = count + 1;
		setCountText ();		
	}
}
void setCountText()
{
countText.text "Count: " + count.ToString ();

}

}

So what is wrong with this code?

countText.text "Count: " + count.ToString ();

When you assign values to variables or properties, you use the equals symbol ‘=’.

If you want the countText.text to be "Count:... , you write countText.text = "Count: " + count.ToString ();