QT创建者的错误

你好，我正在与QT Creator一起构建错误，我想知道有人知道为什么会犯这些错误。谢谢

main.cpp：

#include <QApplication>
#include <QGraphicsScene>
#include <QGraphicsRectItem>
#include <QGraphicsView>

int main(int argc, char *argv[]){
    QApplication a(argc, argv);
    //Create Scene
    QGraphicsScene * scene = new QGraphicsScene();
    //Creat Item To Put Into Scene
    QGraphicsRectItem * rect = new QGraphicsRectItem();
    rect->setRect(100, 50, 100, 100);
    //Add Item To Scene aka buffer
    scene->addItem(rect);
    //add a view
    QGraphicsView * view = new QGraphicsView(scene);
    view->show();
    return a.exec();
}

mygame.pro：

#-------------------------------------------------
#
# Project created by QtCreator 2017-05-03T12:14:31
#
#-------------------------------------------------
QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = mygame
TEMPLATE = app
# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked as 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 you use 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
HEADERS  +=

编译输出：

Error while building/deploying project mygame (kit: Desktop Qt 5.8.0 MSVC2015_64bit)
When executing step "qmake"

我不确定是什么犯了这些错误(单词和更多单词以获取更多细节，因此"看起来您的帖子需要更多细节"会消失...它不会消失，所以我将继续键入直到它选择这样做，但看起来它不会很快到达任何时间。我们走了(。