Ошибка PyQt5 PySide2 PyQtGraph

Traceback (most recent call last):
  File "C:\Users\User\Desktop\питон\программы\projectYL.py", line 269, in start_equation
    self.second_form = Graphic()
  File "C:\Users\User\Desktop\питон\программы\projectYL.py", line 200, in __init__
    self.initUI()
  File "C:\Users\User\Desktop\питон\программы\projectYL.py", line 231, in initUI
    self.layout.addWidget(self.plot_widget)
TypeError: 'PySide2.QtWidgets.QBoxLayout.addWidget' called with wrong argument types:
  PySide2.QtWidgets.QBoxLayout.addWidget(PlotWidget)
Supported signatures:
  PySide2.QtWidgets.QBoxLayout.addWidget(PySide2.QtWidgets.QWidget, int = 0, PySide2.QtCore.Qt.Alignment = Default(Qt.Alignment))
  PySide2.QtWidgets.QBoxLayout.addWidget(PySide2.QtWidgets.QWidget)

self.plot_widget = pg.PlotWidget()
self.layout.addWidget(self.plot_widget)

import sys
import sqlite3
from PyQt5.QtWidgets import QApplication, QMainWindow, QVBoxLayout, QWidget, QLabel, QLineEdit, QPlainTextEdit
import pyqtgraph as pg
import numpy as np
from PyQt5.QtWidgets import QPushButton
from PySide2.QtCore import *
from PySide2.QtGui import *
from PySide2.QtWidgets import *

try:
    from PySide2 import QtWidgets
except Exception as e:
    print(e)
    from PyQt5 import QtWidgets
    
import pyqtgraph as pg
import numpy as np
 
class Window(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__()
        grid = QtWidgets.QGridLayout(self) 
        self.plot = pg.PlotWidget()
        btn = QtWidgets.QPushButton('Push')
        grid.addWidget(self.plot,0,0,4,4)
        grid.addWidget(btn,4,0,1,1)
        btn.clicked.connect(self.on_btn)
        y = np.random.normal(size=100)
        self.plot.plot(y, pen="r")
 
    
    def on_btn(self):
        k = np.random.random()
        y = [np.sin(i*k)*k for i in range(100)]
        self.plot.plot(y, pen='g')
        
 
if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

>>> import pyqtgraph as pg
>>> pg.Qt
<module 'pyqtgraph.Qt' from '/usr/local/lib/python3.7/site-packages/pyqtgraph/Qt/__init__.py'>
>>> pg.QtWidgets
<module 'pyqtgraph.Qt.QtWidgets' from '/usr/local/lib/python3.7/site-packages/pyqtgraph/Qt/QtWidgets/__init__.py'>
>>> pg.QtCore
<module 'pyqtgraph.Qt.QtCore' from '/usr/local/lib/python3.7/site-packages/pyqtgraph/Qt/QtCore/__init__.py'>
>>> pg.QtGui
<module 'pyqtgraph.Qt.QtGui' from '/usr/local/lib/python3.7/site-packages/pyqtgraph/Qt/QtGui/__init__.py'>
>>>

import pyqtgraph as pg
print(pg.Qt.QT_LIB)
if pg.Qt.QT_LIB == 'PyQt5':
    from PyQt5 import Qt # и т.д.