The Type Or Namespace UI could not be found - Trying to create a clickable button

Question

Hello! So I am currently trying to create a little weapon shop for a personal project I am working on and I am having a lot of trouble that 45 min of Google could not solve. The biggest problem so far is that Unity is not registering the 'UI' class and I can not figure out why. Here is the current script that I have:

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 using UnityEngine.Events;
 
 public class Master : MonoBehaviour {
 
     public Button store;
     public UI.Button.ButtonClickedEvent onClick;
     public Transform hands;
     public GameObject gun1;
 
     // Use this for initialization
     void Start () {
         store = GetComponent<Button>();
         gun1 = GameObject.FindGameObjectWithTag("Weapon1");
         hands = GameObject.FindGameObjectWithTag("Player").transform;
         onClick = Instantiate(gun1, hands.position, hands.rotation);
     }
     
     // Update is called once per frame
     void Update () {
         store.onClick;
 
     }
 }

The exact errors I get are: Severity Code Description Project File Line Error CS0246 The type or namespace name 'UI' could not be found (are you missing a using directive or an assembly reference?) TDS-AYYYY.CSharp C:\Users\Gavin\Documents\TDS-AYYYY\Assets\Scripts\Master.cs 9

(Line 9 is public UI.Button.ButtonClickedEvent onClick;)

And

Severity Code Description Project File Line Error CS0201 Only assignment, call, increment, decrement, and new object expressions can be used as a statement TDS-AYYYY.CSharp C:\Users\Gavin\Documents\TDS-AYYYY\Assets\Scripts\Master.cs 23

(Line 23 is store.onClick)

Answer 1

I had the same problem and stumbled on this question via google. I fixed it by adding "using UnityEngine.UI" at the top as you did, and then simply removing "UI." from my declarations. It's strange... it must be a bug with Unity itself because there's no reason that using UI.Button as a declaration should fail, I've done it before (at least I have with UI.Text).

Here's my script, it works perfectly now after that tweak:

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 [RequireComponent(typeof(Text))]
 public class ResourceDisplay : MonoBehaviour {
 
     enum resEnum {Wood, Iron, Stone, Gold, Food, Population }
     resEnum resSelect;
     private Text txtComp;
 
     void Start () {
         txtComp = GetComponent<Text>();
     }
     
     void Update () {
         switch (resSelect)
         {
             case resEnum.Wood:
                 txtComp.text = GVars.qWood.ToString();
                 break;
             case resEnum.Iron:
                 txtComp.text = GVars.qIron.ToString();
                 break;
             case resEnum.Stone:
                 txtComp.text = GVars.qStone.ToString();
                 break;
             case resEnum.Gold:
                 txtComp.text = GVars.qGold.ToString();
                 break;
             case resEnum.Food:
                 txtComp.text = GVars.qFood.ToString();
                 break;
             case resEnum.Population:
                 txtComp.text = GVars.qPop.ToString();
                 break;
         }
     }
 }

Answer 2

Answer by HumblPi · May 15 at 05:14 PM

Wow, this saved my butt too. Just transferred an old project to a new computer, and this was just headscratching. Thank you!

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The Type Or Namespace UI could not be found - Trying to create a clickable button

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