Build error. Unresolved external symbol

[aravmadd]

This is what is output of the error

moc_widget.obj:-1: error: LNK2019: unresolved external symbol "private: void __cdecl Widget::setValue(int)" (?setValue@Widget@@AEAAXH@Z) referenced in function "private: static void __cdecl Widget::qt_static_metacall(class QObject *,enum QMetaObject::Call,int,void * *)" (?qt_static_metacall@Widget@@CAXPEAVQObject@@W4Call@QMetaObject@@HPEAPEAX@Z)

I am trying to implement some custom slots and signals for my gui.

This is how my header looks like

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private slots:
    void on_pushButton_clicked();
    void setValue(int value);

signals:
    void valueChanged(int newValue);


private:
    Ui::Widget *ui;

    void init_gui();
    int normalize(int iterations, int curriternum);
    int m_value;

};
#endif // WIDGET_H

If i remove setValue from private slot it is building properly but if i include that its not build ing.

My pro file

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

#ONFIG += c++11

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0


INCLUDEPATH += ..\dependencies\eigen\include\eigen3\Eigen

LIBS += -lwsock32
LIBS += -lws2_32
LIBS +=  -lkernel32 -lkernel32 -lgdi32 -lwinspool -lcomdlg32 -ladvapi32 -lshell32 -lole32 -loleaut32 -luuid -lodbc32 -lodbccp32

SOURCES += \
    main.cpp \
    widget.cpp

HEADERS += \
    widget.h

FORMS += \
    widget.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

As per some posts in stack and qt forum few suggested to run qmake and i did that. When building the error still remains?

[JonB]

@aravmadd
You have declared a private slot setValue() but do not seem to have actually defined the method, hence the link error?