Symbol(s) not found collect2: ld returned 1 exit status

[hubris0010]

I've searched the forums for this problem but none quite matched what's happening to me. I keep getting these error codes and my compile output is:
@ld: warning: directory '/usr/local/pgsql/lib' following -L not found
ld: warning: directory '/tmp/qt-stuff-85167/source/qt-everywhere-opensource-src-4.8.1/Desktop/Qt/4.8.1/gcc/lib' following -L not found
ld: warning: directory '/tmp/qt-stuff-85167/source/qt-everywhere-opensource-src-4.8.1/Desktop/Qt/4.8.1/gcc/lib' following -F not found
Undefined symbols:
"MainWindow::on_MainWindow_destroyed()", referenced from:
MainWindow::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)in moc_mainwindow.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make: *** [Gameattempt4-5.app/Contents/MacOS/Gameattempt4-5] Error 1
make: Leaving directory `~/Gameattempt4-5-build-desktop-Desktop_Qt_4_8_1_for_GCC__Qt_SDK__Debug'
17:10:38: The process "/usr/bin/make" exited with code 2.
Error while building project Gameattempt4-5 (target: Desktop)
When executing build step 'Make'@
I'm running Mac osx 10.6.8 and when I try to delete the Q_OBJECT like almost every post says to do I get a different error.
If I need to give anymore information just tell me.

[Zlatomir]

Have you tried the most simple solution: Clean All -> Run qmake -> Rebuild?

[hubris0010]

Multiple times. That was the first thing I tried.

[Zlatomir]

Show us the code for that class, or if you can't post code describe what are you trying to do, or better try to replicate the behavior in a small test project that you can post here, if you don't find the problem when coding the test code.

[hubris0010]

It's supposed to be a basic text based game.
These are the two files I think are the problem.
@#include "userclass.h"
#include "ui_userclass.h"
#include <QtGui/QApplication>
#include <QtGui/QPushButton>
#include <QtGui/QMessageBox>
#include <QWidget>

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

userclass::~userclass()
{
delete ui;
}
void userclass::on_Fighter_clicked()
{
QMessageBox *choice=new QMessageBox;
choice->setText("You chose the Fighter class");
choice->show();
this->close();
}

void userclass::on_Mage_clicked()
{
QMessageBox *choice=new QMessageBox;
choice->setText("You chose the Mage class");
choice->show();
this->close();
}

void userclass::on_Knight_clicked()
{
QMessageBox *choice=new QMessageBox;
choice->setText("You chose the Knight class");
choice->show();
this->close();
}
@
@#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "userclass.h"
#include <QtGui/QApplication>
#include <QtGui/QPushButton>
#include <QtGui/QMessageBox>
#include <QWidget>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}

MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_2_clicked()
{
QMessageBox *choice=new QMessageBox;
choice->setText("You chose to end the game");
choice->show();
close();
}

void MainWindow::on_pushButton_clicked()
{
QMessageBox *choice=new QMessageBox;
choice->setText("You chose to attack");
choice->show();
userclass user;
user.show();
this->close();
}

void MainWindow::on_actionQuit_triggered()
{
this->close();
}
@

[hubris0010]

I deleted an unnecessary line and the code started working again. Problem solved.