directory not found exception could not find part of path

Shows an unhandled exception. system.reflection.target invocationException. the directory from my ssd to the folder i made, the game, library, scriptassemblies, and assembly-CSharp.dll
My code that i put in before this issue:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class PlayerMovement : MonoBehaviour
6. {
7.     Rigidbody2D body;
8.  
9.     float horizontal;
10.     float vertical;
11.     float moveLimiter = 0.7f;
12.  
13.     public float runSpeed = 20.0f;
14.  
15.     void Start()
16.     {
17.         body = GetComponent<Rigidbody2D>();
18.     }
19.  
20.     void Update()
21.     {
22.         // Gives a value between -1 and 1
23.         horizontal = Input.GetAxisRaw("Horizontal"); // -1 is left
24.         vertical = Input.GetAxisRaw("Vertical"); // -1 is down
25.     }
26.  
27.     void FixedUpdate()
28.     {
29.         if (horizontal != 0 && vertical != 0) // Check for diagonal movement
30.         {
31.             // limit movement speed diagonally, so you move at 70% speed
32.             horizontal *= moveLimiter;
33.             vertical *= moveLimiter;
34.         }
35.  
36.         body.velocity = new Vector2(horizontal * runSpeed, vertical * runSpeed);
37.     }
38.  
39. }

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