为什么在这种情况下会发生Type expected Error？

Question

所以，我正在关注 LogRocket 上的新输入第三人称控制器教程。 我的脚本 (PlayerBaseState) 出现了我在标题中提到的错误。而且我不知道如何解决它，Unity 说问题在第 14 行。

using UnityEngine;

public abstract class PlayerBaseState : State
{
    protected readonly PlayerStateMachine stateMachine;

    protected PlayerBaseState(PlayerStateMachine stateMachine)
    {
        this.stateMachine = stateMachine;
    }

    protected void CalculateMoveDirection()
    {
        Vector3 cameraForward = new(stateMachine.MainCamera.forward.x, 0, stateMachine.MainCamera.forward.z);
        Vector3 cameraRight = new(stateMachine.MainCamera.right.x, 0, stateMachine.MainCamera.right.z);

        Vector3 moveDirection = cameraForward.normalized * stateMachine.InputReader.MoveComposite.y + cameraRight.normalized * stateMachine.InputReader.MoveComposite.x;

        stateMachine.Velocity.x = moveDirection.x * stateMachine.MovementSpeed;
        stateMachine.Velocity.z = moveDirection.z * stateMachine.MovementSpeed;
    }
}

    protected void FaceMoveDirection()
    {
        Vector3 faceDirection = new(stateMachine.Velocity.x, 0f, stateMachine.Velocity.z);

        if (faceDirection == Vector3.zero)
            return;

        stateMachine.transform.rotation = Quaternion.Slerp(stateMachine.transform.rotation, Quaternion.LookRotation(faceDirection), stateMachine.LookRotationDampFactor * Time.deltaTime);
    }

    protected void ApplyGravity()
    {
        if (stateMachine.Velocity.y > Physics.gravity.y)
        {
            stateMachine.Velocity.y += Physics.gravity.y * Time.deltaTime;
        }
    }

    protected void Move()
    {
        stateMachine.Controller.Move(stateMachine.Velocity * Time.deltaTime);
    }

我不是一个很好的 c# 编码员，但我尝试检查字符以查看它们是否正确，我在其他网站上搜索了更多帮助，但我什么也没找到。