Having a issue with Vector3.Slerp

I am currently trying to code recoil and watched a video to help me out but for some reason the .Slerp keeps coming up as a error

Heres the error:

There is no argument given that corresponds to the required formal parameter 't' of 'Vector3.Slerp(Vector3, Vector3, float)

Heres my code:

using UnityEngine;

public class Recoil : MonoBehaviour { //Rotations private Vector3 currentRotation; private Vector3 targetRotation;

 //Hipfire Recoil
 [SerializeField] private float recoilX, recoilY, recoilZ;

 //settings
 [SerializeField] private float snappiness, returnSpeed;

 void Start()
 {
     
 }

 void Update()
 {
     targetRotation = Vector3.Lerp(targetRotation, Vector3.zero, returnSpeed * Time.deltaTime);
     currentRotation = Vector3.Slerp(currentRotation, targetRotation * snappiness * Time.fixedDeltaTime);
     transform.localRotation = Quaternion.Euler(currentRotation);
 }

 public void RecoilFire()
 {
     targetRotation += new Vector3(recoilX, Random.Range(-recoilY, recoilY), Random.Range(-recoilZ, recoilZ));
 }

}