Constructor Error, please assist

Hi everyone, I keep on getting the error below when I try to modify the default constructor for a dialogue box. Here is the constructor

Code:

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explicit NewAccount(QWidget *parent = 0);

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I want to add a QSqlDatabase object in the constructor so that it looks like this

Code:

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explicit NewAccount(QWidget *parent = 0, QSqlDatabase db);

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but I keep on getting this error. Am I doing something wrong?
Attachment 10128

This is pretty basic C++ : default arguments. Your compiler pointed out the error - define a default value just for second parameter or both. Or change the order of constructor parameters.