Traceback (most recent call last):
   File "C:\Users\hrida\Desktop\Code\Python\Typer\main.py", line 43, in <module>
     TyperApp().run()
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\app.py", line 855, in run
     runTouchApp()
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\base.py", line 504, in runTouchApp
     EventLoop.window.mainloop()
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\core\window\window_sdl2.py", line 747, in mainloop
     self._mainloop()
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\core\window\window_sdl2.py", line 479, in _mainloop
     EventLoop.idle()
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\base.py", line 342, in idle
     self.dispatch_input()
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\base.py", line 327, in dispatch_input
     post_dispatch_input(*pop(0))
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\base.py", line 233, in post_dispatch_input
     listener.dispatch('on_motion', etype, me)
   File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\core\window\__init__.py", line 1402, in on_motion
     self.dispatch('on_touch_down', me)
   File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\core\window\__init__.py", line 1418, in on_touch_down
     if w.dispatch('on_touch_down', touch):
   File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\uix\screenmanager.py", line 1191, in on_touch_down
     return super(ScreenManager, self).on_touch_down(touch)
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\uix\widget.py", line 549, in on_touch_down
     if child.dispatch('on_touch_down', touch):
   File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\uix\relativelayout.py", line 288, in on_touch_down
     ret = super(RelativeLayout, self).on_touch_down(touch)
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\uix\widget.py", line 549, in on_touch_down
     if child.dispatch('on_touch_down', touch):
   File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\uix\widget.py", line 549, in on_touch_down
     if child.dispatch('on_touch_down', touch):
   File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\uix\textinput.py", line 1369, in on_touch_down
     if super(TextInput, self).on_touch_down(touch):
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\uix\behaviors\focus.py", line 441, in on_touch_down
     self.focus = True
   File "kivy\properties.pyx", line 497, in kivy.properties.Property.__set__
   File "kivy\properties.pyx", line 544, in kivy.properties.Property.set
   File "kivy\properties.pyx", line 599, in kivy.properties.Property.dispatch
   File "kivy\_event.pyx", line 1214, in kivy._event.EventObservers.dispatch
   File "kivy\_event.pyx", line 1120, in kivy._event.EventObservers._dispatch
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\uix\behaviors\focus.py", line 384, in _on_focus
     self._bind_keyboard()
   File "C:\Users\hrida\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\uix\behaviors\focus.py", line 413, in _bind_keyboard
     on_textinput=self.keyboard_on_textinput)
   File "kivy\_event.pyx", line 419, in kivy._event.EventDispatcher.bind
 AssertionError: None is not callable