I am new to Qt and I have a little problem.

I am trying to create a tic tac toe following a tutorial I found on internet but at some point I get this message :
<pre><code>ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
</code></pre>

I have created an interface with the design editor that worked well but when I try to link buttons through the .cpp life it fails.

Can you help me please?
It is for a school project and I am quitte in a hustle right now.

I run on OSX El Capitan with Qt Creator 3.5.0
Here is my code (classes are in French since I ma french héhé) :

CLASS FILE

<code>

#include "notreclasse.h"
#include "ui_notreclasse.h"

notreClasse::notreClasse(QWidget *parent) :
QDialog(parent),
ui(new Ui::notreClasse)
{
ui->setupUi(this);

connect(ui->b1, SIGNAL(clicked()), this, SLOT(f1()) );
connect(ui->b2, SIGNAL(clicked()), this, SLOT(f2()) );
connect(ui->b3, SIGNAL(clicked()), this, SLOT(f3()) );
connect(ui->b4, SIGNAL(clicked()), this, SLOT(f4()) );
connect(ui->b5, SIGNAL(clicked()), this, SLOT(f5()) );
connect(ui->b6, SIGNAL(clicked()), this, SLOT(f6()) );
connect(ui->b7, SIGNAL(clicked()), this, SLOT(f7()) );
connect(ui->b8, SIGNAL(clicked()), this, SLOT(f8()) );

f_recommencer();

}

notreClasse::~notreClasse()
{
delete ui;
}

void notreClasse ::f0()
{//Fonction executée lorsque l'on clique sur b0
ui->b0->setText(m_laMarque); //Affiche la marque (ie X ou O)
ui->b0->setEnabled(false);//désactive le bouton

if(m_laMarque=="X")//passe de X à O ou de O à X pour le prochain coup
    m_laMarque="O";
else
    m_laMarque="X";

}

void notreClasse::f_recommencer()
{//Cette fonction s'exécute quand on clique sur "Recommencer"
//Elle remet les boutons dans leur état initial
ui->b0->setText(""); //ni X ni O
ui->b0->setEnabled(true); //réactive le bouton si besoin
ui->b1->setText("");
ui->b1->setEnabled(true);
ui->b2->setText("");
ui->b2->setEnabled(true);
ui->b3->setText("");
ui->b3->setEnabled(true);
ui->b4->setText("");
ui->b4->setEnabled(true);
ui->b5->setText("");
ui->b5->setEnabled(true);
ui->b6->setText("");
ui->b6->setEnabled(true);
ui->b7->setText("");
ui->b7->setEnabled(true);
ui->b8->setText("");
ui->b8->setEnabled(true);
m_laMarque="X"; //Toutes les parties commencent par X
}
</code>

HEADER FILE

<code>
#ifndef NOTRECLASSE_H
#define NOTRECLASSE_H

#include <QDialog>

namespace Ui {
class notreClasse;
}

class notreClasse : public QDialog
{
Q_OBJECT

public slots:
void f_recommencer();
void f0();
void f1();
void f2();
void f3();
void f4();
void f5();
void f6();
void f7();
void f8();

public:
explicit notreClasse(QWidget *parent = 0);
~notreClasse();
QString m_laMarque;

private:
Ui::notreClasse *ui;

};

#endif // NOTRECLASSE_H
</code>

ERROR MESSAGE
<code>
Undefined symbols for architecture x86_64:
"notreClasse::f1()", referenced from:
notreClasse::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) in moc_notreclasse.o
"notreClasse::f2()", referenced from:
notreClasse::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) in moc_notreclasse.o
"notreClasse::f3()", referenced from:
notreClasse::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) in moc_notreclasse.o
"notreClasse::f4()", referenced from:
notreClasse::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) in moc_notreclasse.o
"notreClasse::f5()", referenced from:
notreClasse::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) in moc_notreclasse.o
"notreClasse::f6()", referenced from:
notreClasse::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) in moc_notreclasse.o
"notreClasse::f7()", referenced from:
notreClasse::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) in moc_notreclasse.o
"notreClasse::f8()", referenced from:
notreClasse::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) in moc_notreclasse.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [MorpionTuto.app/Contents/MacOS/MorpionTuto] Error 1
13:42:22: Le processus "/usr/bin/make" s'est terminé avec le code 2.
Erreur lors de la compilation/déploiement du projet MorpionTuto (kit : Desktop Qt 5.5.0 clang 64bit)
When executing step "Make"
</code>