Does not exist in the namespace 'System.Threading.Tasks'

[Purple]

Today I wanted to finish the animation for the 2D course itself on Unity, but I got a very strange error:
Assets\Scripts\PlayerController.cs(1,30): error CS0234: The type or namespace name ‘Dataflow’ does not exist in the namespace ‘System.Threading.Tasks’ (are you missing an assembly reference?)

Please explain what needs to be done? (Here is the code itself)

using System.Threading.Tasks.Dataflow;
using System.Numerics;
using System.Data;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerController : MonoBehaviour
{
    [SerializeField] private float moveSpeed = 1f;

    private PlayerControls playerControls;
    private UnityEngine.Vector2 movement;
    private Rigidbody2D rb;
    private Animator myAnimator;
    private SpriteRenderer mySpriteRenderer;
    


    private void Awake()
    {
        playerControls = new PlayerControls();
        rb = GetComponent<Rigidbody2D>();
        myAnimator = GetComponent<Animator>();
        mySpriteRenderer = GetComponent<SpriteRenderer>();
    }

    private void OnEnable()
    {
        playerControls.Enable();
    }

    private void Update()
    {
        PlayerInput();
        AdjustPlayerFacingDirection(); // Call the facing direction adjustment here or as needed.
    }

    private void FixedUpdate()
    {
        Move();
    }

    private void PlayerInput()
    {
        movement = playerControls.Movement.Move.ReadValue<Vector2>();

        myAnimator.SetFloat("moveX", movement.x);
        myAnimator.SetFloat("moveY", movement.y);
    }

    private void Move()
    {
        rb.MovePosition(rb.position + movement * moveSpeed * Time.fixedDeltaTime);
    }

    private void AdjustPlayerFacingDirection()
    {
        Vector3 mousePos = Input.mousePosition;
        Vector3 playerScreenPoint = Camera.main.WorldToScreenPoint(transform.position);

        if (mousePos.x < playerScreenPoint.x)
        {
            mySpriteRenderer.flipX = true;
        }
        else
        {
            mySpriteRenderer.flipX = false; // Use flipX to control horizontal flipping.
        }
    }
}

[Brian_Trotter]

It looks like your code editor has autosuggested some using clauses which have lead to this particular error. Sometimes this happens, where an inappropriate suggestion is made, and you inadvertently trigger an automatic using addition.

I’m actually a bit surprised that it suggested the System.Threading.Tasks.Dataflow, as it’s not in the Unity implementation of C#. In Rider or Visual Studio Community the IntelliSense would know not to include that usings clause.

In this case, you can (and should) remove this usings directive along with System.Numerics; and System.Data; In fact, the only usings clause you should need in this case is

using UnityEngine;