Добавление элементов с использованием делегата в qml

Почему программа не может соединить сигнал addButtonInQml из General.cpp со слотом onAddButtonInQml из LeftPanel.qml?

main.cpp

int main(int argc, char *argv[])
{  
    QGuiApplication app(argc, argv);
    QQuickView view;

    ListFiles *listFiles = new ListFiles();
    view.rootContext()->setContextProperty(QStringLiteral("listFiles"), listFiles);
    General *general= new General(&view);                 
    view.rootContext()->setContextProperty("general", general);

    general->addButtonInList("employees found", "listOfFiles");
    general->addButtonInList("Patterns for requests", "patternsForRequests");
    general->addButtonInList("Request", "request");

    view.setSource(QUrl(QStringLiteral("qrc:/main.qml")));
    view.show();
    return app.exec();
}

General.cpp

#include "General.h"
#include "iostream"

General::General(QQuickView* view) :
    m_appView(view)
{

}

void General::addButtonInList(const QString &nameButton, const QString &page) {
    QString buttonID = "button_"+nameButton;
    std::replace(buttonID.begin(), buttonID.end(), ' ', '_');
    std::vector<QString> button;
    button.push_back(buttonID);
    button.push_back(nameButton);
    std::cout<<"%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%"<<std::endl;
    std::cout<<buttonID.toStdString()<<std::endl;
    std::cout<<nameButton.toStdString()<<std::endl;
    std::cout<<""<<std::endl;
    std::cout<<button[0].toStdString()<<std::endl;
    std::cout<<button[1].toStdString()<<std::endl;
    std::cout<<"%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%"<<std::endl;
    emit addButtonInQml(button);
    buttons.insert(std::pair<QString, QString>(buttonID, page));
}

main.qml

import QtQuick 2.12
import QtQuick.Window 2.12

Rectangle {
    id:root
    visible: true
    width: 1000
    height: 650
    property var widthLeftPanel: 250
    color: "#FDF7E2"
    LeftPanel {
        id:leftPanel
        anchors.top: parent.top
        anchors.topMargin: 20
        anchors.left: parent.left
        width: root.widthLeftPanel
        height: parent.height
    }
}

LeftPanel.qml

import QtQuick 2.0

Item {
    id:leftPanel
    objectName: "leftPanel"
    signal buttonClicked(string msg)
    Connections{
        target: general
        onAddButtonInQml: {
            console.log("this slot")
            listModelLeftButton.append({
            objectNameButton: button[0],
            textButton:button[1]
        })
    }
}

ListView{
    id:listViewLeftPanel
    objectName: "listViewLeftPanel"
    anchors.fill: parent
    anchors.top:parent.top
    clip:true
    delegate:LeftButton{
        z:-1
        width: parent.width
        objectName: model.objectNameButton 
        id: leftButtonDelegate
        Text {
            anchors.horizontalCenter: parent.horizontalCenter
            font.family:"Technic"
            text: model.textButton           
            font.pixelSize:20
        }
        MouseArea {
            id:mouseAreaButtonPageList  
            anchors.fill: parent
            onClicked: {
                console.log("qqqqqq")
                console.log(parent.objectName)
                buttonClicked(parent.objectName)
            }
        }
    }
    model: ListModel {
        id: listModelLeftButton
        objectName: "listModelLeftButton"
        property var objectNameButton
    }
}

Rectangle {
    id: rect
    objectName: "rect"
    z:0
    height: parent.height
    width:1
    anchors.right: parent.right
    anchors.top:parent.top
    color: "black"
}

}