flutter-the-method-was-called-on-null,按照老师的讲解一点点敲代码出来的,IDEA没有报任何错,调试输出时界面全红,显示NoSuchMethodError:The method ‘_debugTypesAreRight’ was called on null.Receive:null. Tried calling _debugTypesAreRight(Instance of ‘TabNavigator’,如果老师看到还麻烦尽快指教,急
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