Splash Ekranında Hata

Python
1 
import sys
from PySide2 import QtCore, QtGui, QtWidgets
from PySide2.QtCore import (QCoreApplication, QPropertyAnimation, QDate, QDateTime, QMetaObject, QObject, QPoint, QRect, QSize, QTime, QUrl, Qt, QEvent)
from PySide2.QtGui import (QBrush, QColor, QConicalGradient, QCursor, QFont, QFontDatabase, QIcon, QKeySequence, QLinearGradient, QPalette, QPainter, QPixmap, QRadialGradient)
from PySide2.QtWidgets import *

## ==> SPLASH SCREEN
from ui_splash_screen import Ui_SplashScreen

## ==> MAIN WINDOW
from ui_main import Ui_MainWindow

## ==> GLOBALS
counter = 0

# YOUR APPLICATION
class MainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)



# SPLASH SCREEN
class SplashScreen(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.ui = Ui_SplashScreen()
        self.ui.setupUi(self)

        ## UI ==> INTERFACE CODES
        ########################################################################

        ## REMOVE TITLE BAR
        self.setWindowFlag(QtCore.Qt.FramelessWindowHint)
        self.setAttribute(QtCore.Qt.WA_TranslucentBackground)


        ## DROP SHADOW EFFECT
        self.shadow = QGraphicsDropShadowEffect(self)
        self.shadow.setBlurRadius(20)
        self.shadow.setXOffset(0)
        self.shadow.setYOffset(0)
        self.shadow.setColor(QColor(0, 0, 0, 60))
        self.ui.dropShadowFrame.setGraphicsEffect(self.shadow)

        ## QTIMER ==> START
        self.timer = QtCore.QTimer()
        self.timer.timeout.connect(self.progress)
        # TIMER IN MILLISECONDS
        self.timer.start(35)


        ## SHOW ==> MAIN WINDOW
        ########################################################################
        self.show()
        ## ==> END ##

    ## ==> APP FUNCTIONS
    ########################################################################
    def progress(self):

        global counter

        # SET VALUE TO PROGRESS BAR
        self.ui.progressBar_1.setValue(counter)

        # CLOSE SPLASH SCREE AND OPEN APP
        if counter > 100:
            # STOP TIMER
            self.timer.stop()

            # SHOW MAIN WINDOW
            self.main = MainWindow()
            self.main.show()

            # CLOSE SPLASH SCREEN
            self.close()

        # INCREASE COUNTER
        counter += 1




if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = SplashScreen()
    sys.exit(app.exec_())

Alınan Hata

TypeError: QWidget(parent: QWidget = None, flags: Union[Qt.WindowFlags, Qt.WindowType] = Qt.WindowFlags()): argument 1 has unexpected type 'SplashScreen'