unbound method () must be called with ... instance as first argument (got nothing instead)

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Subject	unbound method () must be called with ... instance as first argument (got nothing instead)
From	Mohsen Pahlevanzadeh <mohsen@pahlevanzadeh.org>
To	python-list@python.org
Date	Wed, 04 Sep 2013 02:00:16 +0430
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Dear all,

I have the following two lines code in my setup frame:
 ////////////////////// 
 self.showHideConstructor = ui.interface.interface.ShowHide()
 QtCore.QObject.connect(self.pushButtonAdd,
QtCore.SIGNAL(_fromUtf8("clicked()")),self.showHideConstructor,ui.interface.interface.ShowHide.showFindMaterials())
//////////////////////

and i have module ui.interface.interface , it contains ShowHide class,
and it consists showFindMaterials() method.

When i run program , i get the following traceback :
///////////////////////////////////////////
Traceback (most recent call last):
  File "./main.py", line 113, in <module>
    main()
  File "./main.py", line 94, in main
    interfaceObj.showMaterials()
  File "/home/mohsen/codes/amlak/amlak/src/ui/interface/interface.py",
line 82, in showMaterials
    self.ui.setupUi(self.Frame)
  File "/home/mohsen/codes/amlak/amlak/src/ui/materialsFrame.py", line
92, in setupUi
    QtCore.QObject.connect(self.pushButtonAdd,
QtCore.SIGNAL(_fromUtf8("clicked()")),self.showHideConstructor,ui.interface.interface.ShowHide.showFindMaterials())
TypeError: unbound method showFindMaterials() must be called with
ShowHide instance as first argument (got nothing instead)
///////////////////////////////////////////////

Where's problem?

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unbound method () must be called with ... instance as first argument (got nothing instead) Mohsen Pahlevanzadeh <mohsen@pahlevanzadeh.org> - 2013-09-04 02:00 +0430

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