[Kivy] Need to render updated recycler view

[test]

Trouble again...
all that code in python looked very cluttered, so i cleaned up the code rewriting most of the organization in kv. Now the program starts up and runs the first time and then i get this error:

Error:
Traceback (most recent call last):
   File "/home/bunny/Desktop/App/new3.py", line 257, in <module>
     main_root().run()
   File "/usr/lib/python3/dist-packages/kivy/app.py", line 826, in run
     runTouchApp()
   File "/usr/lib/python3/dist-packages/kivy/base.py", line 502, in runTouchApp
     EventLoop.window.mainloop()
   File "/usr/lib/python3/dist-packages/kivy/core/window/window_sdl2.py", line 727, in mainloop
     self._mainloop()
   File "/usr/lib/python3/dist-packages/kivy/core/window/window_sdl2.py", line 460, in _mainloop
     EventLoop.idle()
   File "/usr/lib/python3/dist-packages/kivy/base.py", line 340, in idle
     self.dispatch_input()
   File "/usr/lib/python3/dist-packages/kivy/base.py", line 325, in dispatch_input
     post_dispatch_input(*pop(0))
   File "/usr/lib/python3/dist-packages/kivy/base.py", line 291, in post_dispatch_input
     wid.dispatch('on_touch_up', me)
   File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
   File "/usr/lib/python3/dist-packages/kivy/uix/scrollview.py", line 848, in on_touch_up
     if self.dispatch('on_scroll_stop', touch):
   File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
   File "/usr/lib/python3/dist-packages/kivy/uix/scrollview.py", line 887, in on_scroll_stop
     self.simulate_touch_down(touch)
   File "/usr/lib/python3/dist-packages/kivy/uix/scrollview.py", line 607, in simulate_touch_down
     ret = super(ScrollView, self).on_touch_down(touch)
   File "/usr/lib/python3/dist-packages/kivy/uix/widget.py", line 460, in on_touch_down
     if child.dispatch('on_touch_down', touch):
   File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
   File "/usr/lib/python3/dist-packages/kivy/uix/widget.py", line 460, in on_touch_down
     if child.dispatch('on_touch_down', touch):
   File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
   File "/usr/lib/python3/dist-packages/kivy/uix/behaviors/button.py", line 151, in on_touch_down
     self.dispatch('on_press')
   File "kivy/_event.pyx", line 703, in kivy._event.EventDispatcher.dispatch
   File "kivy/_event.pyx", line 1214, in kivy._event.EventObservers.dispatch
   File "kivy/_event.pyx", line 1138, in kivy._event.EventObservers._dispatch
   File "/home/bunny/Desktop/App/new3.py", line 227, in <lambda>
     question = Button(text= question, size=(480, 40), size_hint=(1, None), on_press= lambda question: self.question_being_read(subject, question))
   File "/home/bunny/Desktop/App/new3.py", line 168, in question_being_read
     root.ids.multi_button.on_press = lambda : self.clock_caller(subject, row, start=True)
   File "kivy/properties.pyx", line 838, in kivy.properties.ObservableDict.__getattr__
   File "kivy/properties.pyx", line 832, in kivy.properties.ObservableDict._weak_return
   File "kivy/weakproxy.pyx", line 40, in kivy.weakproxy.WeakProxy.__class__.__get__
   File "kivy/weakproxy.pyx", line 26, in kivy.weakproxy.WeakProxy.__ref__
 ReferenceError: weakly-referenced object no longer exists

I removed all the Factory imports and made them static. But the basic layout consists of a carousel which i did not make static. So when i press a button, then go back to a previous slide and press another button, it crashes..

kindly advice...