NullReferenceException: Object reference not set to an instance of an object Duihua.duihua (System.Int32 aa) (at Assets/Script/Duihua.cs:78) Duihua.Continue_Button () (at Assets/Script/Duihua.cs:71) UnityEngine.Events.InvokableCall.Invoke () (at <38c6fe84e4c8408ca6bc6e5ae83a0b3f>:0) UnityEngine.Events.UnityEvent.Invoke () (at <38c6fe84e4c8408ca6bc6e5ae83a0b3f>:0) UnityEngine.UI.Button.Press () (at D:/Program Files/Unity/Hub/Editor/2019.4.13f1c1/Editor/Data/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/UI/Core/Button.cs:68) UnityEngine.UI.Button.OnPointerClick (UnityEngine.EventSystems.PointerEventData eventData) (at D:/Program Files/Unity/Hub/Editor/2019.4.13f1c1/Editor/Data/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/UI/Core/Button.cs:110) UnityEngine.EventSystems.ExecuteEvents.Execute (UnityEngine.EventSystems.IPointerClickHandler handler, UnityEngine.EventSystems.BaseEventData eventData) (at D:/Program Files/Unity/Hub/Editor/2019.4.13f1c1/Editor/Data/Resources/PackageManager/BuiltInPackages/com.unity.ugui/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 D:/Program Files/Unity/Hub/Editor/2019.4.13f1c1/Editor/Data/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/EventSystem/ExecuteEvents.cs:261) UnityEngine.EventSystems.EventSystem:Update() (at D:/Program Files/Unity/Hub/Editor/2019.4.13f1c1/Editor/Data/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/EventSystem/EventSystem.cs:377)

这个错误通常是因为您正在尝试访问一个空对象的引用。在这个特定的错误中，它发生在 Duihua.cs 的第 78 行，即在 duihua(int aa) 方法中的某个位置。这意味着您正在尝试访问一个未初始化的对象，或者在尝试访问对象之前，该对象已经被销毁或赋值为 null。

为了解决这个问题，您可以使用调试器来查找代码中引用空对象的位置，并确保在访问对象之前对其进行初始化或检查其是否为空。或者，您可以在代码中添加一些条件语句来确保对象已经初始化并且不为空，然后再进行访问。

例如，在 duihua(int aa) 方法中，您可以添加以下代码来检查对象是否为空：

void duihua(int aa)
{
    if (gameObject == null)
    {
        Debug.LogError("gameObject is null!");
        return;
    }

    // continue with normal duihua() code here
}

这样，如果对象为空，您将看到一个错误消息，并且代码将不会继续执行，从而避免了 NullReferenceException 的发生。