qSlicerScriptedLoadableModule has no attribute named 'layout'?

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def setup(self):
    ScriptedLoadableModuleWidget.setup(self)
    # Joint collapsible button
    jointcollapsibleButton = ctk.ctkCollapsibleButton()
    jointcollapsibleButton.text = "Joints"
    #jointcollapsibleButton.enabled = False
    self.layout.addWidget(jointcollapsibleButton)

I try to write a py module like upper code. But when I add to slicer. I get an error:
Traceback (most recent call last):

File "D:\Program Files\Slicer 4.11.0-2018-12-16\bin\Python\slicer\ScriptedLoadableModule.py", line 87, in init

self.layout = self.parent.layout()

AttributeError: qSlicerScriptedLoadableModule has no attribute named ‘layout’

2

Can you find another error in the error log before this?
Make sure you follow the latest extension module template (that works well).