I'm having trouble understanding what "does not contain a definition for" means.

So inside of my player controller I've have a way to take my current gun and replace it with a new gun (via buy or drop or whatever, thats for later).

 void EquipGun(int i){
         if (currentGun) {
             Destroy(currentGun.gameObject);
         }
         currentGun = Instantiate (guns [i], handHold.position, handHold.rotation) as Gun;
         currentGun.transform.parent = handHold;

 

handHold is my variable for where every gun will be on characters, but instantiating this line with my Gun class is where I get the error because I added the position and rotation for handHold. Here is my Gun class:

 using UnityEngine;
 using System.Collections;
 [RequireComponent (typeof (AudioSource))]
 public class Gun : MonoBehaviour {
 
     public enum GunType {Semi,Burst,Auto};
 
     public LayerMask collisionMask;
     public float gunID;
     public GunType gunType;
     public float rpm;
     public float damage = 1;
 
     public Transform spawn;
     public Transform shellEjectionPoint;
     public Rigidbody shell;
     private LineRenderer tracer;
 
     //System:
     private float secondsBetweenShots;
     private float nextPossibleShootTime;
 
     void Start(){
         secondsBetweenShots = 60 / rpm;
         if (GetComponent<LineRenderer>()) {
             tracer = GetComponent<LineRenderer>();
             }
     }
     
     public void Shoot(){
         if (CanShoot ()) {
 
         Ray ray = new Ray (spawn.position, spawn.forward);
         RaycastHit hit;
 
         float shotDistance = 20;
 
         if (Physics.Raycast (ray,out hit, shotDistance, collisionMask)){
         shotDistance = hit.distance;
 
                 if (hit.collider.GetComponent<Enitity>()){
                     hit.collider.GetComponent<Enitity>().TakeDamage(damage);
 
                 }
     }
 
         nextPossibleShootTime = Time.time + secondsBetweenShots;
         GetComponent<AudioSource>().Play();
 
             if (tracer) {
                 StartCoroutine ("RenderTracer", ray.direction * shotDistance);
             }
 
             Rigidbody newShell = Instantiate(shell, shellEjectionPoint.position,Quaternion.identity) as Rigidbody;
             newShell.AddForce (shellEjectionPoint.forward * Random.Range (150f,200f) + spawn.forward * Random.Range(-10f,10f));
     }
 }
 
     public void ShootContinuous(){
         if (gunType == GunType.Auto) {
             Shoot();
         }
     }
 private bool CanShoot(){
     bool canShoot = true;
     if (Time.time < nextPossibleShootTime){
         canShoot = false;
     }
 
     return canShoot;
 }
     IEnumerator RenderTracer(Vector3 hitPoint){
         tracer.enabled = true;
         tracer.SetPosition (0,spawn.position);
         tracer.SetPosition (1,spawn.position + hitPoint);
 
         yield return null;
         tracer.enabled = false;
     }
 }

Okay sorry, here are my errors, there's six of them.

1 Assets/Scripts/PlayerController.cs(64,62): error CS1061: Type Gun' does not contain a definition for position' and no extension method position' of type Gun' could be found (are you missing a using directive or an assembly reference?)

2 Assets/Scripts/PlayerController.cs(64,81): error CS1061: Type Gun' does not contain a definition for rotation' and no extension method rotation' of type Gun' could be found (are you missing a using directive or an assembly reference?)

3 Assets/Scripts/PlayerController.cs(64,30): error CS1502: The best overloaded method match for UnityEngine.Object.Instantiate(UnityEngine.Object, UnityEngine.Vector3, UnityEngine.Quaternion)' has some invalid arguments 4 Assets/Scripts/PlayerController.cs(64,30): error CS1503: Argument #2' cannot convert object' expression to type UnityEngine.Vector3'

5 Assets/Scripts/PlayerController.cs(65,38): error CS0029: Cannot implicitly convert type Gun' to UnityEngine.Transform'

6 Assets/Scripts/PlayerController.cs(66,26): error CS0120: An object reference is required to access non-static member `UnityEngine.Animator.SetFloat(string, float)'

Thank you, but my gun does have a transform, I have an object "weapon" it's the only thing the Gun script is attached to see:

And thank you for the fix for 4, I put in a quick fix for errors 1, 2, and 3 while I try to figure them out, I still have 1 error left (or rather still 4), error number 6 that comes from my last line with the Animator, I think I can solve that one but I'm trying to understand why Gun have no transform when the object it's attached to does have one.