Queued connection fails on own class

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Hi,

I'm getting this error on my application

QObject::connect: Cannot queue arguments of type 'CModbusResponse&'
(Make sure 'CModbusResponse&' is registered using qRegisterMetaType().)

QObject::connect: Cannot queue arguments of type 'CModbusResponse&'
(Make sure 'CModbusResponse&' is registered using qRegisterMetaType().)

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CModbusResponse is a class that inherits from CModbusMessage. I have registered the classes with "qRegisterMetaType".
The problem is that the connection returns true if "QtirectConnection" is used, but it returns false if "Qt::QueuedConnection" is used.

The classes have their copy constructor.

Thanks,