conversion to 'const QObject *' exists, but is inaccessible

[big_buka]

In my project i have class Scheduller(.h is below)

class Scheduller : QObject
{
	Q_OBJECT
protected:
	Scheduller();
	~Scheduller();
	static Scheduller* _instance;
	static int _instanceCount;
	void timerEvent(QTimerEvent *event);
public:
	static Scheduller* getInstance();
	static void freeInstance();
private:
	int cuurentTimerID;
	QList<SchedulerTask> tasks;
	QApplicationSettings* settings;
	void checkTasks();
public slots:
	void UpdateTasks();
};

class Scheduller : QObject
{
	Q_OBJECT
protected:
	Scheduller();
	~Scheduller();
	static Scheduller* _instance;
	static int _instanceCount;
	void timerEvent(QTimerEvent *event);
public:
	static Scheduller* getInstance();
	static void freeInstance();
private:
	int cuurentTimerID;
	QList<SchedulerTask> tasks;
	QApplicationSettings* settings;
	void checkTasks();
public slots:
	void UpdateTasks();
};

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In some other part of code i have

QObject::connect(this,SIGNAL(tasksChanged()),scheduller,SLOT(UpadteTasks()));

QObject::connect(this,SIGNAL(tasksChanged()),scheduller,SLOT(UpadteTasks()));

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I dont understand why compiler says me
error C2243: 'type cast' : conversion from 'Scheduller *' to 'const QObject *' exists, but is inaccessible
Could any one explain why this happend and how to fix this ?
The answer
hooly s**t....
The answer is because the default inheirt type it private....
class Scheduller : public QObject
sory for making a thread. It may be deleted....