为什么会出现重复定义的报错？

这里为什么会出现重复定义的报错。我的.pro文件里没有重复出现的文件，但是个人认为代码不存在问题，urgent mission！thanks!

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include <QFileDialog>
#include <QMessageBox>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    connect(ui->pushButton_1,SIGNAL(clicked),ui->label_1,SLOT(checkpic1()));
    connect(ui->pushButton_2,SIGNAL(clicked),ui->label_2,SLOT(checkpic1()));
}

Widget::~Widget()
{
    delete ui;
}

QString Widget:: checkpic1()
{
    QString pic1;
    pic1=QFileDialog::getOpenFileName(this,
                                        tr("选择图像"),
                                        "",
                                        tr("Images (*.png *.bmp *.jpg *.tif *.GIF )"));//可打开的文件类型
    if(!pic1.isEmpty())
    {
        QImage* img=new QImage;
        if(! ( img->load(pic1) ) ) //加载图像
            {
                QMessageBox::information(this,
                                         tr("打开图像失败"),
                                         tr("打开图像失败!"));
                delete img;
            }
        ui->label->setPixmap(QPixmap::fromImage(*img));
    }
    return pic1;
}

QString Widget::checkpic2()
{
    QString pic2;
    pic2=QFileDialog::getOpenFileName(this,
                                        tr("选择图像"),
                                        "",
                                        tr("Images (*.png *.bmp *.jpg *.tif *.GIF )"));//可打开的文件类型
    if(!pic2.isEmpty())
    {
        QImage* img=new QImage;
        if(! ( img->load(pic2) ) ) //加载图像
            {
                QMessageBox::information(this,
                                         tr("打开图像失败"),
                                         tr("打开图像失败!"));
                delete img;
            }
        ui->label->setPixmap(QPixmap::fromImage(*img));
    }
    return pic2;
}

.pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# 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 \
    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

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