Added new class to clean Qt application, gotcompile error "No such file or directory"

[sundbergad]

Hi,

I'm fairly new to Qt.

In a larger GUI programming project, on Linux with Qt Creator 5.2. Now I need to split things up and therefor make som tests

I'm about to make a namespace test and in order for that, I create a new QApplication, compile out of the box - OK
Next I add a new C++ class that inherit from QObject.
Straight out of the box, it compiles

Now when I add the class it fails to compile straight of with two errors
Error: all: "No such file or directory"
[first] Error 1

Guess it has to do with paths missing but where??
Suggestions??

#include <QMainWindow>
 
namespace Ui {      class MainWindow;   }
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
....
 
 
#include <QObject>
 
class First : public QObject
{
    Q_OBJECT
public:
    explicit First(QObject *parent = 0);
 
signals:
...
 
// in .cpp
#include "first.h"
 
First::First(QObject *parent) :
    QObject(parent)
{
}

#include <QMainWindow>

namespace Ui {      class MainWindow;   }

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

....


#include <QObject>

class First : public QObject
{
    Q_OBJECT
public:
    explicit First(QObject *parent = 0);

signals:
...

// in .cpp
#include "first.h"

First::First(QObject *parent) :
    QObject(parent)
{
}

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