Can't compile QList<struct>

[mikrocat]

Hi,

in my Header mainwindow.h i declare a struct and a QList inside my MainWindow class.

private:
....
    struct Parameterlevel{
        QString Levelname;
        quint8 Levelindex;
        quint8 Securitylevel;
....
QList<Parameterlevel> TabList;
    };

private:
....
    struct Parameterlevel{
        QString Levelname;
        quint8 Levelindex;
        quint8 Securitylevel;
....
QList<Parameterlevel> TabList;
    };

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I want to create a list where I can add the Parameterlevels later but if I put the declaration of the List in my header, I can't compile the code. My program crashes. If the declaration of the list is in the .cpp there seems to be no problem with it.
Where is my mistake?