'NoneType' object has no attribute 'removeItem'

[mbshqqb]

here is my code:

plotItem = pg.PlotItem()
plotItem.setAxisItems(axisItems={'bottom':pg.AxisItem('bottom')})

when I run this code, it shows the error as below

Traceback (most recent call last):
  File "E:\Workspace\Python\VNPY-master\examples\candle_chart\tick\item\main.py", line 42, in <module>
    plotItem.setAxisItems(axisItems={'bottom':pg.AxisItem('bottom')})
  File "E:\home\.conda\envs\Python310\lib\site-packages\pyqtgraph\graphicsItems\PlotItem\PlotItem.py", line 312, in setAxisItems
    oldAxis.scene().removeItem(oldAxis)
AttributeError: 'NoneType' object has no attribute 'removeItem'

[j9ac9k]

This happens when the QGraphicsScene isn't set. Often this is the case when trying to modify widgets too early, like before calling QApplication.exec() or before calling QWidget.show().