Как исправить ошибку с созданием "main.moc"?

devalone,
*.pro:

QT       += core gui network

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = untitled2
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which has 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 \
        mainwindow.cpp

HEADERS += \
        mainwindow.h

FORMS += \
        mainwindow.ui

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtNetwork/QNetworkAccessManager>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private slots:
    void MarketCurr(QNetworkReply *reply);
    void GetCurr(QNetworkReply *reply);

private:
    Ui::MainWindow *ui;
    QNetworkAccessManager *networkManager;
};

#endif // MAINWINDOW_H

main.cpp

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>
#include <QUrlQuery>
#include <QtNetwork/QNetworkReply>
#include <QUrl>
#include <QDebug>
#include <QList>
#include <QListWidget>
#include <QtGui>

QListWidgetItem* item;

class ListController : public QObject {
    Q_OBJECT
public slots:
    void onListDoubleClicked(const QModelIndex& index)
    {
        if(!index.isValid())
            return;

        if(QListWidget* listWgt = dynamic_cast<QListWidget*>(sender()))
        {
            if(QListWidgetItem* item = listWgt->takeItem(index.row()))
            {
                delete item;
            }
        }
    }
};

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    networkManager = new QNetworkAccessManager();
    //connect(networkManager, &QNetworkAccessManager::finished, this, &MainWindow::MarketCurr);
    //networkManager->get(QNetworkRequest(QUrl("https://bittrex.com/api/v1.1/public/getmarkets")));
    connect(networkManager, &QNetworkAccessManager::finished, this, &MainWindow::GetCurr);
    networkManager->get(QNetworkRequest(QUrl("https://bittrex.com/api/v1.1/public/getmarketsummaries")));
}

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

void MainWindow::GetCurr(QNetworkReply *reply)
{
    if(!reply->error()){

        QJsonDocument document = QJsonDocument::fromJson(reply->readAll());

        QJsonObject root = document.object();

        QJsonValue jv = root.value("result");
        if(jv.isArray()){
            QJsonArray ja = jv.toArray();
            for(int i = 0; i < ja.count(); i++){
                QJsonObject subtree = ja.at(i).toObject();

                item = new QListWidgetItem(subtree.value("MarketName").toString() + " (High: " + QString::number(subtree.value("High").toDouble()) + "; Low: " + QString::number(subtree.value("Low").toDouble()) + ")");
                ui->listWidget->addItem(item);
             }
        }
    }
    ListController LC;
    connect(ui->listWidget, SIGNAL(doubleClicked(QModelIndex)), &LC, SLOT(onListDoubleClicked(QModelIndex)));

    reply->deleteLater();
}

void MainWindow::MarketCurr(QNetworkReply *reply)
{
    if(!reply->error()){

        QJsonDocument document = QJsonDocument::fromJson(reply->readAll());

        QJsonObject root = document.object();
        //ui->textEdit->append(root.keys().at(0) + ": " + root.value(root.keys().at(0)).toString());

        QJsonValue jv = root.value("result");
        if(jv.isArray()){
            QJsonArray ja = jv.toArray();
            for(int i = 0; i < ja.count(); i++){
                QJsonObject subtree = ja.at(i).toObject();
                //QString("%1").arg(subtree.value("MinTradeSize").toDouble())
                //ui->textEdit->append(subtree.value("MarketName").toString()); QListWidgetItem(subtree.value("MarketName").toString()
                //ui->textEdit->append(QString::number(root.value("MinTradeSize").toInt()));

                item = new QListWidgetItem(subtree.value("MarketName").toString());
                ui->listWidget->addItem(item);
            }
        }
    }
    reply->deleteLater();
}

#include "main.moc"

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