本文参考自 http://forum.china.unity3d.com/thread-1099-1-1.html
使用NGUI版本3.7.5。
在创建了一个UIRoot后，有时会报NullReferenceException的错误,如下图。虽然报错但是不影响运行。
截取部分报错输出是
- NullReferenceException: Object reference not set to an instance of an object
- UIPanel.get_worldCorners () (at Assets/NGUI/Scripts/UI/UIPanel.cs:623)
- UIPanelInspector.OnSceneGUI () (at Assets/NGUI/Scripts/Editor/UIPanelInspector.cs:87)
- System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
- Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
- System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at
双击错误进入NGUI的UIPanel脚本，会定位到这段代码
- if (anchorOffset && mCam == null || mCam.transform.parent != cachedTransform)
将这段代码修改为下面的代码即可修复此错误
- if (anchorOffset && (mCam == null || mCam.transform.parent != cachedTransform))
【转】NGUI创建UIRoot后报NullReferenceException的解决办法
原文：http://www.cnblogs.com/mimime/p/6233976.html
