Ошибка unknown type name qcoreapplication

I’ve just installed Qt Creator and created console project. And when i want to run my project i have error: unknown type name ‘QCoreApplication’. But i didn’t write any code yet. Where is a problem, why qt doesn’t see it?
My code is:

#include <QCoreApplication>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    return a.exec();
}

My .pro file is:

CONFIG += c++11 console
CONFIG -= app_bundle

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += 
        main.cpp

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

Hello to all,

I am cross compiling for an embedded development board and I have some strange issues with qt creator. qtbase was compiled successfully for the target board.

When I create a new project choosing the board that I want to build for, either a simple Console application or a QWidget application, from the first time that I configure the project, some issues appear in qt ‘Issues’ tab. Those issues concern the main types of like qt.

For console

main.cpp:7: error: unknown type name ‘QCoreApplication’

For QWidget

main.cpp:6: error: variable has incomplete type ‘QApplication’
qwindowdefs.h:81: forward declaration of ‘QApplication’
main.cpp:7: error: unknown type name ‘MainWindow’

The most strange thing is that the console program compiles and runs successfully remotely on the board, which gives me the indication that

Does anybody has any experience which any similar issue?

Thank you in advance
aplastiras

в mainwindow.h:

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

дает мне:

класс MainWindow: общедоступный
QMainWindow/home/joachim/Versuch/Test_2_HelloWorld/mainwindow.h:10: ошибка: ожидаемое имя класса

Q_OBJECT
/home/joachim/Versuch/Test_2_HelloWorld/mainwindow.h:12: ошибка: имя неизвестного типа ‘Q_OBJECT’

публичный:
/home/joachim/Versuch/Test_2_HelloWorld/mainwindow.h:14: ошибка: ожидаемое имя участника или ‘;’ после спецификаторов объявления

@шефф:

What’s wrong with it?
First I ignored this peculiar requirement of stackoverflow. Then I had to figure out what’S going on. Wasting 3min later it worked. Now in this post it doesn’t work again. I had to manually indent all lines.
That’s wrong with it.
Und nebenbei, dieser HTML Eingabeeditor ist der letzte Dreck. Der kann keinen richtigen Zeilenumbruch, Shift + return versteht der nicht. Ich hab schon wieder n Blutdruck… Wahrscheinlich geschrieben von den gleichen Typen die vi geschrieben haben, alles auf einer ach so geilen Codebase von Unix Sys V von 1969…