How can I fix “Cannot read value of type Vector2 from composite” error in Unity?

Question

I'm making a 2D game with Unity using the new Input System. I used spriteRenderer.flipX to flip the player but since it is made of three parts (body and two eyes), the spriteRenderer didn't work. Also, I couldn't convert them to a single sprite because I need the eyes in order to animate them. So, I decided to use transform.localscale for flipping and change movementInput value from a float to a Vector2. The problem is that when I press the arrow or AD keys to move the character, an error pops up saying "Cannot read value of type Vector2 from composite". This error is from InputActionState which is a long and complicated code related to the new Input System. Also, getting input from gamepad causes the same error. I don't know what does this error mean and how can I fix it. Now, the player can jump but it can't move or flip. You can see the code, the error and my action map down below.

This is my Player Controller:

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

public class PlayerController : MonoBehaviour
{
    [SerializeField] private float speed, jumpSpeed;
    [SerializeField] private LayerMask ground;
    private PlayerActionControls playerActionControls;
    private Rigidbody2D rb;
    private PolygonCollider2D pol;
    private Animator animator;
    private bool facingRight = true;
    private Vector2 movementInput;

private void Awake() {
       
    playerActionControls = new PlayerActionControls();  
    rb = GetComponent<Rigidbody2D>(); 
    pol = GetComponent<PolygonCollider2D>();
    animator = GetComponent<Animator>();   
      
   }

private void OnEnable() {

    playerActionControls.Enable();

   }

 private void OnDisable() {

    playerActionControls.Disable();
   }

 void Start()
   {
     playerActionControls.Land.Jump.performed += ctx => Jump(ctx.ReadValue<float>());

    }   

private void Jump(float val) {
       if (val == 1 && IsGrounded()) {
           rb.AddForce(new Vector2(0, jumpSpeed), ForceMode2D.Impulse);       
       }
   }
     

private bool IsGrounded() {
  
       Vector2 topLeftPoint = transform.position;
       topLeftPoint.x -= pol.bounds.extents.x;
       topLeftPoint.y += pol.bounds.extents.y;

       Vector2 bottomRightPoint = transform.position;
       bottomRightPoint.x += pol.bounds.extents.x;
       bottomRightPoint.y -= pol.bounds.extents.y;

       return Physics2D.OverlapArea(topLeftPoint, bottomRightPoint, ground);
   }
     void FixedUpdate()
   {    
       if(facingRight == false && movementInput.x > 0){       
           Flip();
       } else if (facingRight == true && movementInput.x < 0){        
           Flip();    
       }
   }
   void Flip(){
        facingRight = !facingRight;
        Vector3 Scaler = transform.localScale;
        Scaler.x *= -1;
        transform.localScale = Scaler;
   }
  
   void Update()
   {
      movementInput = playerActionControls.Land.Move.ReadValue<Vector2>();
       
       Vector2 currentPosition = transform.position;  // This was a Vector3 but since I got the error  "Operator '+=' is ambiguous on operands of type 'Vector3' and 'Vector2", I changed it to a Vector2.
       currentPosition += movementInput * speed * Time.deltaTime;
       transform.position = currentPosition;
     
   }
}

This is the error I get when I want to move the player.

This is my action map.

Answer 1

There are a few errors in your code.

1. In your Update you declare a second local movementInput Vector2. This one hides your movementInput in your class and while no errors are produced, your Flip() won't work. Delete the Vector2 in front of movementInput.
2. Your actionMap looks wrong. Your action needs to be of the type Value with ControlType Vector2. Next you are missing the Composite 2D Vector for your input. It should look like this

Answer 2

The only reason why I want to change the value from float to Vector2 is for movementInput.x. If I keep movementInput as a float, then I get an error because the float doesn't contain a definition for x

Yes, a float doesn't have an x property because it's a single numeric value. The x property of Vector2 is a float. It sounds like you need to brush up on your basic data structures like floats and Vectors.

What you need is this:

private float movementInput;

void FixedUpdate() {    
    if(facingRight == false && movementInput > 0){       
        Flip();
    } else if (facingRight == true && movementInput < 0){        
        Flip();    
    }
}

void Update() {
    movementInput = playerActionControls.Land.Move.ReadValue<float>();
       
    transform.Translate(movementInput * speed * Time.deltaTime, 0);
}