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下面代码的报错的原因是什么？求大佬

import sys
import os
from PySide2.QtWidgets import*
from PySide2.QtCore import QUrl
from PySide2.QtWebEngineWidgets import QWebEngineView
from ui_Cibrtqit import Ui_Cibrtqit
import time

class Cibrtqit(QMainWindow, Ui_Cibrtqit):
    def __init__(self):
        super().__init__()
        self.setupUi(self)
        self.init_set()
        self.show()
        self.label_3.clicked.connect(self.time)#报错代码

    def init_set(self):
        self.browser = QWebEngineView()

    def time(self):
        er = time.ctime()
        self.label_3.setText(er)
            

if __name__ == "__main__":
    app = QApplication(sys.argv)

    window = Cibrtqit()

    sys.exit(app.exec_())