求助，呼叫了QMessagebox之后崩潰

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'Qt1.ui'
#
# Created by: PyQt5 UI code generator 5.13.0
#
# WARNING! All changes made in this file will be lost!
import sys
from Pyqt5開發 import Qt1

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import *

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.horizontalLayoutWidget = QtWidgets.QWidget(self.centralwidget)
        self.horizontalLayoutWidget.setGeometry(QtCore.QRect(210, 150, 296, 59))
        self.horizontalLayoutWidget.setObjectName("horizontalLayoutWidget")
        self.gridLayout = QtWidgets.QGridLayout(self.horizontalLayoutWidget)
        self.gridLayout.setContentsMargins(0, 0, 0, 0)
        self.gridLayout.setObjectName("gridLayout")
        self.gridLayout_2 = QtWidgets.QGridLayout()
        self.gridLayout_2.setObjectName("gridLayout_2")
        self.label = QtWidgets.QLabel(self.horizontalLayoutWidget)
        self.label.setObjectName("label")
        self.gridLayout_2.addWidget(self.label, 0, 0, 1, 1)
        self.label_2 = QtWidgets.QLabel(self.horizontalLayoutWidget)
        self.label_2.setObjectName("label_2")
        self.gridLayout_2.addWidget(self.label_2, 1, 0, 1, 1)
        self.gridLayout.addLayout(self.gridLayout_2, 0, 0, 1, 1)
        self.verticalLayout_2 = QtWidgets.QVBoxLayout()
        self.verticalLayout_2.setObjectName("verticalLayout_2")
        self.lineEdit = QtWidgets.QLineEdit(self.horizontalLayoutWidget)
        self.lineEdit.setObjectName("lineEdit")
        self.verticalLayout_2.addWidget(self.lineEdit)
        self.lineEdit_2 = QtWidgets.QLineEdit(self.horizontalLayoutWidget)
        self.lineEdit_2.setEchoMode(QtWidgets.QLineEdit.Password)
        self.lineEdit_2.setObjectName("lineEdit_2")
        self.verticalLayout_2.addWidget(self.lineEdit_2)
        self.gridLayout.addLayout(self.verticalLayout_2, 0, 1, 1, 1)
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(240, 250, 93, 28))
        self.pushButton.setObjectName("pushButton")
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setGeometry(QtCore.QRect(380, 250, 93, 28))
        self.pushButton_2.setObjectName("pushButton_2")
        self.radioButton = QtWidgets.QRadioButton(self.centralwidget)
        self.radioButton.setGeometry(QtCore.QRect(538, 186, 115, 19))
        self.radioButton.setObjectName("radioButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 26))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        self.pushButton.clicked.connect(self.button1)
        self.pushButton_2.clicked.connect(MainWindow.close)
        self.radioButton.clicked.connect(self.radiobutton)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)



    def button1(self):
        text = self.lineEdit.text()
        text2 = self.lineEdit_2.text()
        if text == '11' and text2 == '11':
            QMessageBox.about(self,"標題","登入成功")
        else:
            QMessageBox.about(self,"標題","登入失敗")


    def radiobutton(self):
        if self.radioButton.isChecked():
            self.lineEdit_2.setEchoMode(QtWidgets.QLineEdit.Normal)
        else:
            self.lineEdit_2.setEchoMode(QtWidgets.QLineEdit.Password)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "登錄界面"))
        self.label.setText(_translate("MainWindow", "User Name:"))
        self.label_2.setText(_translate("MainWindow", "User PassWord:"))
        self.lineEdit.setPlaceholderText(_translate("MainWindow", "請輸入用戶名"))
        self.lineEdit_2.setPlaceholderText(_translate("MainWindow", "請輸入密碼"))
        self.pushButton.setText(_translate("MainWindow", "Login"))
        self.pushButton_2.setText(_translate("MainWindow", "Cancel"))
        self.radioButton.setText(_translate("MainWindow", "顯示"))



if __name__=='__main__':
    #創建QApplication類的實體
    app=QApplication(sys.argv)
    #創建一個視窗
    mainWindow=QMainWindow()
    ui= Qt1.Ui_MainWindow()
    ui.setupUi(mainWindow)
    mainWindow.show()
    sys.exit(app.exec())

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