Assets/Standard Assets/Characters/FirstPersonCharacter/PlayerVitals.cs(38,13): error CS0246: The type or namespace name `FirstPersonController' could not be found. Are you missing a using directive or an assembly reference?HELP

using UnityEngine; using UnityEngine.UI;

public class PlayerVitals : MonoBehaviour { [Header("Health Settings")] public Slider healthSlider; public int maxHealth; public int healthFallRate;

 [Header("Thirst Settings")]
 public Slider thirstSlider;
 public int maxThirst;
 public int thirstFallRate;

 [Header("Hunger Settings")]
 public Slider hungerSlider;
 public int maxHunger;
 public int hungerFallRate;

 [Header("Stamina Settings")]
 public Slider staminaSlider;
 public int maxStamina;
 private int staminaFallRate;
 public int staminaFallMult;
 private int staminaRegainRate;
 public int staminaRegainMult;

 [Header("Temperature Settings")]
 public float freezingTemp;
 public float currentTemp;
 public float normalTemp;
 public float heatTemp;
 public Text tempNumber;
 public Image tempBG;

 private CharacterController charController;
 private FirstPersonController playerController;

 void Start()
 {
     charController = GetComponent<CharacterController>();
     playerController = GetComponent<FirstPersonController>();

     healthSlider.maxValue = maxHealth;
     healthSlider.value = maxHealth;

     thirstSlider.maxValue = maxThirst;
     thirstSlider.value = maxThirst;

     hungerSlider.maxValue = maxHunger;
     hungerSlider.value = maxHunger;

     staminaSlider.maxValue = maxStamina;
     staminaSlider.value = maxStamina;

     staminaFallRate = 1;
     staminaRegainRate = 1;
 }

 void UpdateTemp()
 {
     tempNumber.text = currentTemp.ToString("00.0");
 }

 void Update()
 {
     //TEMPERATURE CONTROLLER
     if (currentTemp <= freezingTemp)
     {
         tempBG.color = Color.blue;
         UpdateTemp();
     }

     else if (currentTemp >= heatTemp - 0.2)
     {
         tempBG.color = Color.red;
         UpdateTemp();
     }

     else
     {
         tempBG.color = Color.green;
         UpdateTemp();
     }

     //HEALTH CONTROLLER
     if (hungerSlider.value <= 0 && (thirstSlider.value <= 0))
     {
         healthSlider.value -= Time.deltaTime / healthFallRate * 2;
     }

     else if(hungerSlider.value <= 0 || thirstSlider.value <= 0 || currentTemp <= freezingTemp || currentTemp >= heatTemp)
     {
         healthSlider.value -= Time.deltaTime / healthFallRate;
     }

     if (healthSlider.value <= 0)
     {
         CharacterDeath();
     }

     //HUNGER CONTROLLER
     if (hungerSlider.value >= 0)
     {
         hungerSlider.value -= Time.deltaTime / hungerFallRate;
     }

     else if (hungerSlider.value <= 0)
     {
         hungerSlider.value = 0;
     }

     else if (hungerSlider.value >= maxHunger)
     {
         hungerSlider.value = maxHunger;
     }

     //THIRST CONTROLLER
     if (thirstSlider.value >= 0)
     {
         thirstSlider.value -= Time.deltaTime / thirstFallRate;
     }

     else if (thirstSlider.value <= 0)
     {
         thirstSlider.value = 0;
     }

     else if (thirstSlider.value >= maxThirst)
     {
         thirstSlider.value = maxThirst;
     }

     //STAMINA CONTROL SECTION

     if (charController.velocity.magnitude > 0 && Input.GetKey(KeyCode.LeftShift))
     {
         staminaSlider.value -= Time.deltaTime / staminaFallRate * staminaFallMult;

         if (staminaSlider.value > 0)
         {
             currentTemp += Time.deltaTime / 5; //TEMPERATURE
         }
     }

     else
     {
         staminaSlider.value += Time.deltaTime / staminaRegainRate * staminaRegainMult;

         if (currentTemp >= normalTemp)
         {
             currentTemp -= Time.deltaTime / 10; //TEMPERATURE
         }
     }

     if (staminaSlider.value >= maxStamina)
     {
         staminaSlider.value = maxStamina;
     }

     else if (staminaSlider.value <= 0)
     {
         staminaSlider.value = 0;
         playerController.m_RunSpeed = playerController.m_WalkSpeed;
     }

     else if (staminaSlider.value >= 0)
     {
         playerController.m_RunSpeed = playerController.m_RunSpeedNorm;
     }
 }

 void CharacterDeath()
 {
     //DO SOMETHING HERE!
 }

}