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

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)

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Spawner : MonoBehaviour
6. {
7.    
8.     public GameObject wallPrefab;
9.     private int randWall;
10.     private float spawnWait;
11.  
12.     public float spawnFreq = 10;
13.  
14.     public int wallCount;
15.  
16.     // Start is called before the first frame update
17.     void Start()
18.     {
19.  
20.  
21.         InvokeRepeating("SpawnWall", 0, spawnFreq);
22.     }
23.  
24.     // Update is called once per frame
25.     void Update()
26.     {
27.         wallCount = FindObjectOfType<Wall>().Length;
28.  
29.         if (wallCount == 0)
30.         {
31.             spawnFreq = spawnFreq - 0.5f;
32.         }
33.        
34.     }
35.  
36.     void SpawnWall()
37.     {
38.         Vector3 spawnPos = new Vector3(Random.Range(-10, 10), 1.5f, 0);
39.        
40.  
41.         Instantiate(wallPrefab, spawnPos, wallPrefab.transform.rotation);
42.     }
43.  
44.  
45. }
46.  

 

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