【Python/Kivy】ButtonとSliderが同時に存在するプログラムで、Buttonのみを動作させるには？

Buttonを先に操作した際のエラー。個人的なフォルダ情報が含まれる為一部書き換えてあります

1 Traceback (most recent call last): 2 File "(作業フォルダ)\Python\kivyvyvy.py", line 49, in <module> 3 KivyvyvyApp().run() 4 File "(作業フォルダ)\Python\Python_system\lib\site-packages\kivy\app.py", line 955, in run 5 runTouchApp() 6 File "(作業フォルダ)\Python\Python_system\lib\site-packages\kivy\base.py", line 574, in runTouchApp 7 EventLoop.mainloop() 8 File "(作業フォルダ)\Python\Python_system\lib\site-packages\kivy\base.py", line 339, in mainloop 9 self.idle() 10 File "(作業フォルダ)\Python\Python_system\lib\site-packages\kivy\base.py", line 383, in idle 11 self.dispatch_input() 12 File "(作業フォルダ)\Python\Python_system\lib\site-packages\kivy\base.py", line 334, in dispatch_input 13 post_dispatch_input(*pop(0)) 14 File "(作業フォルダ)\Python\Python_system\lib\site-packages\kivy\base.py", line 263, in post_dispatch_input 15 listener.dispatch('on_motion', etype, me) 16 File "kivy\_event.pyx", line 731, in kivy._event.EventDispatcher.dispatch 17 File "(作業フォルダ)\Python\Python_system\lib\site-packages\kivy\core\window\__init__.py", line 1664, in on_motion 18 self.dispatch('on_touch_up', me) 19 File "kivy\_event.pyx", line 731, in kivy._event.EventDispatcher.dispatch 20 File "(作業フォルダ)\Python\Python_system\lib\site-packages\kivy\core\window\__init__.py", line 1701, in on_touch_up 21 if w.dispatch('on_touch_up', touch): 22 File "kivy\_event.pyx", line 731, in kivy._event.EventDispatcher.dispatch 23 File "(作業フォルダ)\Python\Python_system\lib\site-packages\kivy\uix\widget.py", line 611, in on_touch_up 24 if child.dispatch('on_touch_up', touch): 25 File "kivy\_event.pyx", line 731, in kivy._event.EventDispatcher.dispatch 26 File "(作業フォルダ)\Python\Python_system\lib\site-packages\kivy\uix\widget.py", line 611, in on_touch_up 27 if child.dispatch('on_touch_up', touch): 28 File "kivy\_event.pyx", line 727, in kivy._event.EventDispatcher.dispatch 29 File "kivy\_event.pyx", line 1307, in kivy._event.EventObservers.dispatch 30 File "kivy\_event.pyx", line 1191, in kivy._event.EventObservers._dispatch 31 File "(作業フォルダ)\Python\Python_system\lib\site-packages\kivy\lang\builder.py", line 55, in custom_callback 32 exec(__kvlang__.co_value, idmap) 33 File "<string>", line 11, in <module> 34 File "(作業フォルダ)\Python\kivyvyvy.py", line 29, in slider_up 35 if self.is_down: 36 AttributeError: 'Kivyvyvy' object has no attribute 'is_down'