simple question

[assismvla]

what is wrong

----> mainwindow.h
#include <QVBoxLayout>
...
private:
QVBoxLayout *layoutGrupos;
 
---->mainwindow.cpp
layoutGrupos = new QVBoxLayout();

----> mainwindow.h
#include <QVBoxLayout>
...
private:
QVBoxLayout *layoutGrupos;

---->mainwindow.cpp
layoutGrupos = new QVBoxLayout();

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I do not understand what is wrong above

but when I declare all in the cpp it works ! why ??

---->mainwindow.cpp
QVBoxLayout *layoutGrupos = new QVBoxLayout();

---->mainwindow.cpp
QVBoxLayout *layoutGrupos = new QVBoxLayout();

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