PyQt5 QScrollArea : How do I add Widgets inside the scroll area in a realtime?

I wanted to Add labels using the loop via after pressing the Button so I can check if the pyqt5 scroll area is working. But I'm unable to do so. I know somewhere I'm doing wrong.

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication, QWidget, QScrollArea, QVBoxLayout, QGroupBox, QLabel, 
QPushButton, QFormLayout

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(700, 394)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")

        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(320, 30, 61, 31))

        font = QtGui.QFont()
        font.setFamily("Roboto Medium")
        font.setPointSize(14)
        self.label.setFont(font)
        self.label.setObjectName("label")
        self.update = QtWidgets.QPushButton(self.centralwidget)
        self.update.setGeometry(QtCore.QRect(300, 300, 121, 41))
        self.update.setObjectName("update")
        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

        self.update.clicked.connect(self.update_function)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", "Scroll"))
        self.update.setText(_translate("MainWindow", "Update"))

    def update_function(self):
        n = 20
        labelLis = []
        text = 'Inside the scroll area'
        for i in range(n):
            labelLis.append(QLabel(text))
            self.formLayout.addRow(labelLis[i])
        self.groupBox.setLayout(formLayout)

        area = QScrollArea()
        area.setWidget(self.formLayout)
        area.setGeometry(140, 70, 431, 221)
        area.setWidgetResizable(True)

        layout = QVBoxLayout(self)
        layout.addWidget(area) 

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

Im getting this exit code:

Process finished with exit code -1073740791 (0xC0000409)