namespace error cs0246 :how can i fix it.plz tell me in details!

namespace Assets.Code

{
public class PlayerController
{

	private readonly Player _player;
	
	private  float _baseVelocity,
	_targetVelocity,
	_variableVelocity;
	public vector3 MousePosition { get; private set; }
	
	public float CurrentVelocity { get; private set; }
	
	public float MaxVariableVelocity{ get; set; }
	
	public float Minimumvelocity { get; set ; }
	
	public float Acceleration { get; set ; }
	
	public float velocityDamp { get; set; }

	public float RotationSpeed { get; set ;}
	
	public bool UseRelativeMovement { get ; set ;}
	
	public vector2 MouseSensitivity { get; set ; }
	
	
	
	
	
	
	public PlayerController (Player player)
	{
		MaxVariableVelocity = 20;
		Acceleration = 70;
		velocityDamp = 20;
		RotationSpeed = 0.3f;
		
		MouseSensitivity = new vector2 (700, 700);
		UseRelativeMovement = false;
		
		
		_Player = player;
	}
	public void Update()
	{
		Screen.lockCursor = UseRelativeMovement;
		if (UseRelativeMovement) { 
			MousePosition += new vector3 (Input.GetAxis ("Mouse X") * Time.deltaTime * MouseSensitivity.x,
			                              Input.GetAxis ("Mouse Y") * Time.deltaTime * MouseSensitivity.y);
		} else
			MousePosition = Input.mousePosition;
		
		UpdatePosition ();
		UpdateRotation ();
		
		
	}
	
	private void UpdatePosition()
	{
		_variableVelocity = Mathf.Clamp (_variableVelocity + Input.GetAxis ("Vertical") * Time.deltaTime * Accleration, 0, MaxVariableVelocity);
		
		_targetVelocity = _variableVelocity + Minimumvelocity;
		
		CurrentVelocity = Mathf.Lerp (CurrentVelocity, _targetVelocity, Time.deltaTime * velocityDamp);
		
		_Player.transform.Translate (0,0,CurrentVelocity * Time.deltaTime, Space.Self);
	}
	private void UpdateRotation()
	{
		var mouseMovement = (MousePosition - (new vector3 (Screen.width / 2f, screen.heighjt / 2f))) * .2f;
		
		if (mouseMovement .sqrMagnitude >= 1) 
			
			_Player.transform.Rotate(new vector3(-mouseMovement .y, mouseMovement .x, 0) * RotationSpeed);
		
		
	}
	
}

}

//erorr1 :Assets/Code/PlayerController.cs(29,24): error CS0246: The type or namespace name `vector2’ could not be found. Are you missing a using directive or an assembly reference?

//erorr2 :Assets/Code/PlayerController.cs(29,24): error CS0246: The type or namespace name `vector3’ could not be found. Are you missing a using directive or an assembly reference?

To fix change all vector2 to Vector2 and all vector3 to Vector3

Case matters in programming. The compiler doesn’t have a definition for vector2, so it throws an error. There is a definition for Vector2.