My shooting system wont work, help

I am making a 2D platformer shooter game. After coding for an hour or so I tried it out but to my disappointment, it gave an error. I have now been trying to fix it for an hour but has stumped me.

I get these two errors

 NullReferenceException: Object reference not set to an instance of an object
 ShootingScript.Shoot (BulletInfo bullet) (at Assets/Scripts/ShootingScript.cs:111)
 ShootingScript.Update () (at Assets/Scripts/ShootingScript.cs:40)

 NullReferenceException: Object reference not set to an instance of an object
 ShootingScript.Start () (at Assets/Scripts/ShootingScript.cs:25)

This is my script

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class ShootingScript : MonoBehaviour
 {
     [SerializeField]
     public WeaponList[] weaponLists;
 
     WeaponScriptableObj currentWeapon;
     BulletInfo bullet1;
     BulletInfo bullet2;
 
     int currentAmmo;
     int maxAmmo;
 
     int oldCurrentAmmo;
     int oldWeaponSlot;
 
     public GameObject blankBullet;
     public GameObject firePoint;
 
     void Start()
     {
         bullet1 = currentWeapon.regularBullets; <-----Line 25
         bullet2 = currentWeapon.specialBullets;
 
         ChangeWeapon(1);
     }
 
     void Update()
     {
         //Firing input
         if (Input.GetButton("Fire1") && currentAmmo >= 1)
         {
             Shoot(bullet1);
         }
         if (Input.GetButtonDown("Fire2") && currentAmmo >= 2)
         {
             Shoot(bullet2); < -------- Line 40
         }
       
     public void Shoot(BulletInfo bullet)
     {
         //Shooting logic
         GameObject currentShotBullet = Instantiate(blankBullet, firePoint.transform.position, firePoint.transform.rotation);
         currentShotBullet.GetComponent<BlankBullet>().FireBullet(bullet.bulletSpeed, bullet.damage, bullet.range, bullet.bulletSprite); <------ Line 111
     }
 }