Не подключается скроллбар в диалоговом окне

# -*- coding: utf-8 -*-
 
# Form implementation generated from reading ui file 'ui_2_test.ui'
#
# Created by: PyQt5 UI code generator 5.15.2
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.
 
 
from PyQt5 import QtCore, QtGui, QtWidgets
 
 
class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(640, 480)
        self.verticalLayout = QtWidgets.QVBoxLayout(Dialog)
        self.verticalLayout.setObjectName("verticalLayout")
        self.scrollArea = QtWidgets.QScrollArea(Dialog)
        self.scrollArea.setWidgetResizable(True)
        self.scrollArea.setObjectName("scrollArea")
        self.scrollAreaWidgetContents = QtWidgets.QWidget()
        self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 618, 458))
        self.scrollAreaWidgetContents.setObjectName("scrollAreaWidgetContents")
        y=50
        for i in range(5):
            self.i = QtWidgets.QLabel(self.scrollAreaWidgetContents)
 
            self.i.setGeometry(QtCore.QRect(50, y, 500, 120))
            font = QtGui.QFont()
            font.setFamily("Montserrat")
            font.setBold(True)
            font.setWeight(75)
            self.i.setFont(font)
            self.i.setText(str(i))
            self.i.setAlignment(QtCore.Qt.AlignCenter)
            self.i.setWordWrap(True)
            self.i.setObjectName(str(i))
            y+= 130
        self.scrollArea.setWidget(self.scrollAreaWidgetContents)
        self.verticalLayout.addWidget(self.scrollArea)
 
        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)
 
    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
 
 
if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Dialog = QtWidgets.QDialog()
    ui = Ui_Dialog()
    ui.setupUi(Dialog)
    Dialog.show()
    sys.exit(app.exec_())