'Script' does not contain a defitition for 'Length'

Unity Engine
1

So while trying to script something that could check how many prefabed game objects have been destroyed from the spawner script, I came across an error saying I wouldn’t convert a class to an integer. This shouldn’t have been a problem because the tutorial where I got this encountered the same error and fixed it with putting .Length at the end of the line. So I do this and I get an error saying that the class that the line of code is referencing doesn’t have a definition for Length. So then I played around with it and I think the line thinks that I’m trying to call on a variable from a different class. Any help would nice (also if you couldn’t tell, I’m pretty new to all of this)

TLDR: .Length is being a butt plz help (Line 27)

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

public class Spawner : MonoBehaviour
{
   
    public GameObject wallPrefab;
    private int randWall;
    private float spawnWait;

    public float spawnFreq = 10;

    public int wallCount;

    // Start is called before the first frame update
    void Start()
    {


        InvokeRepeating("SpawnWall", 0, spawnFreq);
    }

    // Update is called once per frame
    void Update()
    {
        wallCount = FindObjectOfType<Wall>().Length;

        if (wallCount == 0)
        {
            spawnFreq = spawnFreq - 0.5f;
        }
       
    }

    void SpawnWall()
    {
        Vector3 spawnPos = new Vector3(Random.Range(-10, 10), 1.5f, 0);
       

        Instantiate(wallPrefab, spawnPos, wallPrefab.transform.rotation);
    }

  
}
2

You probably want to use FindObjectsOfType because that returns an array, but the function you are calling is returning a single object.