ui not declared in scope

[steve.bush]

HEADER FILE

#include <QMainWindow>
#include "ui_form.h"
 
class Form1:public QMainWindow
{
Q_OBJECT
public:
	Form1();
	~Form1();
 
protected slots:
        void function1();
}

#include <QMainWindow>
#include "ui_form.h"

class Form1:public QMainWindow
{
Q_OBJECT
public:
	Form1();
	~Form1();

protected slots:
        void function1();
}

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CPP FILE

#include "form1.h"
#include <QDebug>
#include <QFile>
#include <QTextStream>
#include <QTimer>
#include <QDialog>
#include <QMessageBox>
#include <QStringListModel>
 
Form1::Form1():QMainWindow(NULL,0)
{
       connect(ui.action_button, SIGNAL(clicked()), this, SLOT(function1()));
}
 
void Form1::function1()
{
}
 
Form1::~Form1()
{
}

#include "form1.h"
#include <QDebug>
#include <QFile>
#include <QTextStream>
#include <QTimer>
#include <QDialog>
#include <QMessageBox>
#include <QStringListModel>

Form1::Form1():QMainWindow(NULL,0)
{
       connect(ui.action_button, SIGNAL(clicked()), this, SLOT(function1()));
}

void Form1::function1()
{
}

Form1::~Form1()
{
}

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Error is on line 12 in the CPP file.