Problems with Create with Code Lesson 3.3 Don't Just Stand There Error CS0246

I am still having problems with my code. I am getting this CS0246 Error

error CS0246: The type or namespace name `_Other_' Could not be found.
Are you missing a using directive of assembly reference?

I am a Newbie but I wanna do things right, so here is my code with Code Tags

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class PlayerController : MonoBehaviour
6. {
7.     private Rigidbody playerRb;
8.     private Animator playerAnim;
9.     public float jumpForce = 10;
10.     public float gravityModifier;
11.     public bool isOnGround = true;
12.     public bool gameOver = false;
13.  
14.     // Start is called before the first frame update
15.     void Start()
16.     {
17.         playerRb = GetComponent<Rigidbody>();
18.         playerAnim = GetComponent<Animator>();
19.         Physics.gravity *= gravityModifier;
20.     }
21.  
22.     // Update is called once per frame
23.     void Update()
24.     {
25.         if (Input.GetKeyDown(KeyCode.Space) && isOnGround)
26.         {
27.             playerRb.AddForce(Vector3.up * 10 * jumpForce, ForceMode.Impulse);
28.             isOnGround = false;
29.             playerAnim.SetTrigger("Jump_trig");
30.             {
31.  
32.             }
33.         }
34.     }
35.     // here is the first new reference to "other" this is where I am not sure how
36.     // to fix this since it appears that the reference is invalid how do I fix this?
37.  
38.         private void OnCollisionEnter(Collision collision other)
39.     {
40.             if (other.gameObject.CompareTag("Ground"))
41.         {
42.             isOnGround = true;
43.         }   else if (other.gameObject.CompareTag("Obstacle"))
44.         {
45.             Debug.Log("Game Over Woody");
46.             gameOver = true;
47.             playerAnim.SetBool("Death_b", true);
48.             playerAnim.SetInteger("DeathType_int", 1);
49.         }
50.     }
51. }

 

There is a mistake in Part 6 of this lesson (Set up a falling animation), where this code appears, hence your confusion.

 

Thank you so very much, I will just ignore and move on.