error

[INFO              ] [Logger      ] Record log in /home/yash/.kivy/logs/kivy_16-12-11_55.txt
[INFO              ] [Kivy        ] v1.9.1
[INFO              ] [Python      ] v2.7.9 (default, Apr  2 2015, 15:33:21) 
[GCC 4.9.2]
[INFO              ] [Factory     ] 179 symbols loaded
[INFO              ] [Image       ] Providers: img_tex, img_dds, img_gif, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO              ] [Text        ] Provider: sdl2
[INFO              ] [OSC         ] using <multiprocessing> for socket
[INFO              ] [Window      ] Provider: sdl2(['window_egl_rpi'] ignored)
[INFO              ] [GL          ] OpenGL version <3.0 Mesa 10.5.9>
[INFO              ] [GL          ] OpenGL vendor <Intel Open Source Technology Center>
[INFO              ] [GL          ] OpenGL renderer <Mesa DRI Intel(R) HD Graphics 5500 (Broadwell GT2) >
[INFO              ] [GL          ] OpenGL parsed version: 3, 0
[INFO              ] [GL          ] Shading version <1.30>
[INFO              ] [GL          ] Texture max size <8192>
[INFO              ] [GL          ] Texture max units <32>
[INFO              ] [Window      ] auto add sdl2 input provider
[INFO              ] [Window      ] virtual keyboard not allowed, single mode, not docked
 Traceback (most recent call last):
   File "/home/yash/Desktop/yaki29/Screen-Transition-App/main.py", line 103, in <module>
     ScreenApp().run()
   File "/usr/lib/python2.7/dist-packages/kivy/app.py", line 802, in run
     root = self.build()
   File "/home/yash/Desktop/yaki29/Screen-Transition-App/main.py", line 102, in build
     return	TransitionWidget()
   File "/usr/lib/python2.7/dist-packages/kivy/uix/pagelayout.py", line 67, in __init__
     super(PageLayout, self).__init__(**kwargs)
   File "/usr/lib/python2.7/dist-packages/kivy/uix/layout.py", line 72, in __init__
     super(Layout, self).__init__(**kwargs)
   File "/usr/lib/python2.7/dist-packages/kivy/uix/widget.py", line 320, in __init__
     Builder.apply(self, ignored_consts=self._kwargs_applied_init)
   File "/usr/lib/python2.7/dist-packages/kivy/lang.py", line 1970, in apply
     self._apply_rule(widget, rule, rule, ignored_consts=ignored_consts)
   File "/usr/lib/python2.7/dist-packages/kivy/lang.py", line 2157, in _apply_rule
     '{}: {}'.format(e.__class__.__name__, e), cause=tb)
 kivy.lang.BuilderException: Parser: File "<inline>", line 58:
 ...
      56:		        height: self.texture_size[1]
      57:		        # onscroll_stop: root.anime()
 >>   58:		        on_scroll_start: root.anime()
      59:		        # background_color: 1, 0, 0, 1
      60:		        AnchorLayout:
 ...
 AttributeError: scroll_start
   File "/usr/lib/python2.7/dist-packages/kivy/lang.py", line 2148, in _apply_rule
     raise AttributeError(key)
 
[Finished in 0.4s with exit code 1]
[shell_cmd: python -u "/home/yash/Desktop/yaki29/Screen-Transition-App/main.py"]
[dir: /home/yash/Desktop/yaki29/Screen-Transition-App]
[path: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games]