QT QML QAbstractListModel deleted function error - c++

Question

I am trying to pass a c++ user model to qml and get an error that I don't understand.
I use a manager class that should reads in the users and fills the listmodel.
The list model itself should be pass to qml via Q_PROPERTY.
The manager class is known in the qml context.
In the public method of the manager class, the compiler tells me that private m_listModel is a deleted function.
UserManager.h
#pragma once
#include <QObject>
#include <QMap>
#include "UserListModel.h"
class UserManager : public QObject
{
Q_OBJECT
public:
explicit UserManager(QObject* parent = nullptr);
Q_PROPERTY(UserListModel model READ getModel)
UserListModel getModel() { return m_listModel; }
private:
UserListModel m_listModel;
};
UserListModel getModel() { return m_listModel; } gives the error on m_listModel
Error is this
error C2280: "UserListModel::UserListModel(const UserListModel &)" : Es wurde versucht, auf eine gelöschte Funktion zu verweisen
UserManager.cpp
#include "UserManager.h"
UserManager::UserManager(QObject* parent)
{
}
void UserManager::initialize(QMap<QString, QString> args)
{
m_listModel.addModel(UserModel("user1", "0000"));
m_listModel.addModel(UserModel("user2", "9999"));
}
UserListModel.h
#pragma once
#include <QObject>
#include <QAbstractListModel>
struct UserModel {
UserModel() {}
UserModel(const QString name, const QString password) : name(name), password(password) {}
QString name;
QString password;
};
class UserListModel : public QAbstractListModel
{
Q_OBJECT
public:
explicit UserListModel(QObject* parent = 0);
enum Roles { NameRole = Qt::UserRole, PasswordRole };
int rowCount(const QModelIndex& parent = QModelIndex()) const override;
QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
QHash<int, QByteArray> roleNames() const override;
void addModel(const UserModel model);
private:
QList<UserModel> m_models;
};
UserListModel.cpp
#include "UserListModel.h"
UserListModel::UserListModel(QObject* parent)
{
}
int UserListModel::rowCount(const QModelIndex& parent) const
{
return m_models.count();
}
QVariant UserListModel::data(const QModelIndex& index, int role) const
{
if (!index.isValid()) return QVariant();
const UserModel user = m_models.at(index.row());
if (role == NameRole) return user.name;
else if (role == PasswordRole) return user.password;
else return QVariant();
}
QHash<int, QByteArray> UserListModel::roleNames() const
{
static QHash<int, QByteArray> mapping{ {NameRole, "name"}, {PasswordRole, "password"} };
return mapping;
}
void UserListModel::addModel(const UserModel model)
{
beginInsertRows(QModelIndex(), rowCount(), rowCount());
m_models << model;
endInsertRows();
}
Sorry if it is a beginner's mistake, I'm just starting to learn qt and c++.