Why is Unity throwing error CS0103?

Question

Unity

error message:

code:

using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Reflection;
using UnityEngine;
using UnityEngine.UI;

public class BattleController : MonoBehaviour
{
    // Параметры очереди, игрока и противника, а также их отображения
    public int PL_HP = 200;
    public float PL_Magic = 500;
    public int Enemy_HP = 180;
    public float Reduction_of_Magic = 1;
    public Text Enemy_HP_Display;
    public Text PL_HP_Display;
    public Text PL_Magic_Display;
    public bool Bot_Turn = false;
    private static System.Random rnd = new System.Random();
    private int Delay = rnd.Next(0, 3);
    private float Rdn = rdn.Next(1.9, 2.0);
    //очередь компьютера
    void Update()
    {
        if (Bot_Turn = true)
        {
            if (!(Rnd = 1.9))
            {
                PL_HP = PL_HP - 35;
            }
            else
            {
                PL_HP = PL_HP - 20;
            }
        }
    }
    //восстановление магии игрока(закончить позже)
    private void FixedUpdate()
    {
        
    }
    // атаки игрока
    public void PL_Attack1()
    {
        if (Bot_Turn = false & PL_Magic > 20)
        {
            Enemy_HP = Enemy_HP - 25;
            PL_Magic = PL_Magic - 20;
            Bot_Turn = true;
        }
    }
    public void PL_Attack2()
    {
        if (Bot_Turn = false & PL_Magic > 32)
        {
            Enemy_HP = Enemy_HP - 40;
            PL_Magic = PL_Magic - 32;
            Bot_Turn = true;
        }
    }
}