Ошибки в файле moc при попытке соединить сигнал со слотом

void Form::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
    moc_form.cpp:79:72: warning: redundant parentheses surrounding declarator
    moc_form.cpp:80:67: error: no member named 'move' in namespace 'std'
 
void *Form::qt_metacast(const char *_clname)
    moc_form.cpp:116:21: error: cannot initialize object parameter of type 'QWidget' with an expression of type 'Form'
 
int Form::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
    moc_form.cpp:121:20: error: cannot initialize object parameter of type 'QWidget' with an expression of type 'Form'
    moc_form.cpp:126:32: error: cannot initialize a parameter of type 'QObject *' with an rvalue of type 'Form *'
    moc_form.cpp:73:40: note: passing argument to parameter '_o' here
 
QString Form::sendData(QString _t1)
    moc_form.cpp:140:73: error: no member named 'addressof' in namespace 'std'
    moc_form.cpp:141:5: error: no matching function for call to 'activate'
    qobjectdefs.h:401:17: note: candidate function not viable: no known conversion from 'Form *' to 'QObject *' for 1st argument
    qobjectdefs.h:402:17: note: candidate function not viable: no known conversion from 'Form *' to 'QObject *' for 1st argument
    qobjectdefs.h:400:17: note: candidate function not viable: requires 3 arguments, but 4 were provided

// h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include "form.h"
 
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
 
 
private slots:
    void recieveData(QString);
 
    void on_pushButton_clicked();
 
private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

//cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
 
void MainWindow::on_pushButton_clicked()
{
    Form *add1 = new Form;
    add1->show();
    QObject::connect(add1, SIGNAL(sendData()), this, SLOT(recieveData(QString str)));
}
 
void MainWindow :: recieveData(QString str){
    QString lst = str;
 
    ui->listWidget->addItem(lst);
}

// h
#ifndef FORM_H
#define FORM_H
 
#include <QWidget>
 
namespace Ui {
class Form;
}
 
class Form : public QWidget
{
    Q_OBJECT
 
public:
    explicit Form(QWidget *parent = nullptr);
    ~Form();
 
private slots:
    void on_pushButton_clicked();
 
 
signals:
    QString sendData(QString);
 
private:
    Ui::Form *ui;
};
 
#endif // FORM_H

//cpp
#include "form.h"
#include "ui_form.h"
 
Form::Form(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Form)
{
    ui->setupUi(this);
}
 
Form::~Form()
{
    delete ui;
}
 
void Form::on_pushButton_clicked()
{
    emit sendData(ui->lineEdit->text()); // вызываем сигнал, в котором передаём введённые данные
    close();
}

QObject::connect(&add1, SIGNAL(sendData(QString str)), this, SLOT(recieveData()));

QObject::connect(&add1, SIGNAL(sendData(QString str)), this, SLOT(recieveData(QString str)));

QObject::connect: No such signal Form::sendData(QString str) in 
QObject::connect:  (sender name:   'Form')
QObject::connect:  (receiver name: 'MainWindow')

QObject::connect(&add1, SIGNAL(sendData(QString str)), this, SLOT(recieveData(QString str)));

QObject::connect(&add1, SIGNAL(sendData(QString)), this, SLOT(recieveData(QString )));