animation not working

Questions & Answers
1

Hi so im making a combo when you click multiple times and when i play it says: NullReferenceException: Object reference not set to an instance of an object
WeaponController.Update () (at Assets/Scripts/WeaponController.cs:33)
heres the code:

 [SerializeField] GameObject katana;
        bool canAttack = true;
        [SerializeField] float attackCooldown = 1.0f;
        float nextFireTime = 0f;
        int numberofClicks = 0;
        float lastClickTime = 0;
        float maxcombodelay = 1;
        public bool isAttacking = false;
        [SerializeField] AudioClip swordEffect;
        AudioSource source;
        Animator anim;
        [SerializeField] TextMeshProUGUI beanSelect;
    
    void Update()
        {
            if (Input.GetMouseButtonDown(0))
            {
                if (canAttack)
                {
                    swordAttack();
                }
            }
            if (anim.GetCurrentAnimatorStateInfo(0).normalizedTime > 0.7f && anim.GetCurrentAnimatorStateInfo(0).IsName("hit1"))
            {
                anim.SetBool("hit1", false);
            }
            if (anim.GetCurrentAnimatorStateInfo(0).normalizedTime > 0.7f && anim.GetCurrentAnimatorStateInfo(0).IsName("hit2"))
            {
                anim.SetBool("hit2", false);
            }
            if (anim.GetCurrentAnimatorStateInfo(0).normalizedTime > 0.7f && anim.GetCurrentAnimatorStateInfo(0).IsName("hit3"))
            {
                anim.SetBool("hit3", false);
            }
            if (anim.GetCurrentAnimatorStateInfo(0).normalizedTime > 0.7f && anim.GetCurrentAnimatorStateInfo(0).IsName("hit4"))
            {
                anim.SetBool("hit4", false);
                numberofClicks = 0;
            }
            if (Time.time - lastClickTime > maxcombodelay)
            {
                numberofClicks = 0;
            }
            if (Time.time > nextFireTime)
            {
                if (Input.GetMouseButtonDown(0))
                {
                    swordAttack();
                }
            }
        }
        public void swordAttack()
        {
            if (beanSelect.enabled == true)
            {
                return;
            }
            isAttacking = true;
            lastClickTime = Time.time;
            numberofClicks++;
            Animator anim = katana.GetComponent<Animator>();
            if (numberofClicks == 1)
            {
                anim.SetTrigger("Attack");
            }
            numberofClicks = Mathf.Clamp(numberofClicks, 0, 3);
            if (numberofClicks >= 2 && anim.GetCurrentAnimatorStateInfo(0).normalizedTime > 0.7f && anim.GetCurrentAnimatorStateInfo(0).IsName("hit2"))
            {
                anim.SetBool("hit2", false);
                anim.SetBool("hit3", true);
            }
            if (numberofClicks >= 2 && anim.GetCurrentAnimatorStateInfo(0).normalizedTime > 0.7f && anim.GetCurrentAnimatorStateInfo(0).IsName("hit3"))
            {
                anim.SetBool("hit3", false);
                anim.SetBool("hit4", true);
            }
            canAttack = false;
            source.PlayOneShot(swordEffect);
            StartCoroutine(resetAttack());
        }
2

You have declare the Animator anim; but you are getting the Animator component in swordAttack(), you should get Animator component in Start method and remove the line Animator anim = katana.GetComponent<Animator>(); from swordAttack()

void Start()
{
	anim = katana.GetComponent<Animator>();
}