Too simple compile error to be found by me??!!!

[jpn]

You're mixing up class declaration and constructor declaration.

class MyClassName : public MyBaseClassName
{
    public:
        MyClassName(/*ctor params*/);
};

class MyClassName : public MyBaseClassName
{
    public:
        MyClassName(/*ctor params*/);
};

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PS. This is a basic C++ issue which has nothing to do with Qt..