unity报错：MissingComponentException: There is no 'CanvasGroup' attached to the "popupPanel" game object, but a script is trying to access it. You probably need to add a CanvasGroup to the game object "popupPanel". Or your script needs to check if the component is attached before using it. ButtonController.OnButtonClick () (at Assets/Scripts/ButtonController.cs:29) UnityEngine.Events.InvokableCall.Invoke () (at <1b1edefaa08b47a39f5182510f3f9ef9>:0) UnityEngine.Events.UnityEvent.Invoke () (at <1b1edefaa08b47a39f5182510f3f9ef9>:0) UnityEngine.UI.Button.Press () (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/UI/Core/Button.cs:68) UnityEngine.UI.Button.OnPointerClick (UnityEngine.EventSystems.PointerEventData eventData) (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/UI/Core/Button.cs:110) UnityEngine.EventSystems.ExecuteEvents.Execute (UnityEngine.EventSystems.IPointerClickHandler handler, UnityEngine.EventSystems.BaseEventData eventData) (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/EventSystem/ExecuteEvents.cs:50) UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/EventSystem/ExecuteEvents.cs:261) UnityEngine.EventSystems.EventSystem:Update() (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/EventSystem/EventSystem.cs:377)

这个错误是由于你的代码中的某一个脚本试图访问一个名为“popupPanel”的游戏对象上的CanvasGroup组件，但是该组件不存在。解决此问题的方法是：

1. 在“popupPanel”游戏对象上添加CanvasGroup组件。你可以在Inspector窗口中选中该游戏对象，然后点击“Add Component”按钮来添加组件。

2. 在脚本中添加检查代码，确保该组件存在再进行访问。你可以使用GetComponent<CanvasGroup>()方法来获取CanvasGroup组件，然后检查返回值是否为空。

例如，在ButtonController.cs脚本的第29行之前添加以下代码：

CanvasGroup canvasGroup = popupPanel.GetComponent<CanvasGroup>();
if (canvasGroup == null)
{
    Debug.LogError("CanvasGroup component not found on popupPanel game object.");
    return;
}

这将检查“popupPanel”游戏对象上是否存在CanvasGroup组件，如果不存在，则在控制台打印错误消息，并退出OnClick方法的执行。

相关问题

unity报错：MissingComponentException: There is no 'AudioSource' attached to the "GameObject" game object, but a script is trying to access it. You probably need to add a AudioSource to the game object "GameObject". Or your script needs to check if the component is attached before using it. DynamicPlayAudio.Start () (at Assets/EasyAR/Resources/Scripts/DynamicPlayAudio.cs:13)

这个错误是因为你的脚本在试图访问一个名为"GameObject"的游戏对象上的AudioSource组件，但是该游戏对象上并没有附加AudioSource组件。你需要在该游戏对象上添加一个AudioSource组件，或者在使用该组件之前，先检查该游戏对象是否已经添加了该组件。你可以在脚本的第13行检查是否存在AudioSource组件，如果不存在，可以添加代码来添加该组件，如下所示：

AudioSource audioSource = gameObject.GetComponent<AudioSource>();
if(audioSource == null){
    audioSource = gameObject.AddComponent<AudioSource>();
}

这样就可以避免这个错误了。