AttributeError: 'NoneType' object has no attribute 'normal_velocity'

[livibetter]

I don't really know how to run FlappyKivy, first time trying Kivy, I got this error with both Python 2.7 and 3.3 using ac253fc34170fd4b605d3a8dd347536fdf52f5c9:

$ python3 FlappyBird.py
[INFO              ] Kivy v1.8.0
[INFO              ] [Logger      ] Record log in /home/livibetter/.kivy/logs/kivy_14-05-08_7.txt
[INFO              ] [Factory     ] 157 symbols loaded
[DEBUG             ] [Cache       ] register <kv.image> with limit=None, timeout=60s
[DEBUG             ] [Cache       ] register <kv.atlas> with limit=None, timeout=Nones
[INFO              ] [Image       ] Providers: img_tex, img_dds, img_pygame, img_pil, img_gif
[DEBUG             ] [Cache       ] register <kv.texture> with limit=1000, timeout=60s
[DEBUG             ] [Cache       ] register <kv.shader> with limit=1000, timeout=3600s
[DEBUG             ] [Cache       ] register <kv.lang> with limit=None, timeout=Nones
[DEBUG             ] [Cache       ] register <kv.loader> with limit=500, timeout=60s
[INFO              ] [Loader      ] using a thread pool of 2 workers
[DEBUG             ] [App         ] Loading kv <./flappybird.kv>
[DEBUG             ] [App         ] kv <./flappybird.kv> not found
[DEBUG             ] [Window      ] Ignored <egl_rpi> (import error)
[INFO              ] [Window      ] Provider: pygame(['window_egl_rpi'] ignored)
libpng warning: iCCP: Not recognizing known sRGB profile that has been edited
[DEBUG             ] [Window      ] Display driver x11
[DEBUG             ] [Window      ] Actual window size: 800x600
[DEBUG             ] [Window      ] Actual color bits r8 g8 b8 a0
[DEBUG             ] [Window      ] Actual depth bits: 24
[DEBUG             ] [Window      ] Actual stencil bits: 8
[DEBUG             ] [Window      ] Actual multisampling samples: 2
[INFO              ] [GL          ] OpenGL version <b'2.1 Mesa 10.0.4'>
[INFO              ] [GL          ] OpenGL vendor <b'X.Org R300 Project'>
[INFO              ] [GL          ] OpenGL renderer <b'Gallium 0.4 on ATI RV515'>
[INFO              ] [GL          ] OpenGL parsed version: 2, 1
[INFO              ] [GL          ] Shading version <b'1.20'>
[INFO              ] [GL          ] Texture max size <4096>
[INFO              ] [GL          ] Texture max units <16>
[DEBUG             ] [Shader      ] Fragment compiled successfully
[DEBUG             ] [Shader      ] Vertex compiled successfully
[DEBUG             ] [ImagePygame ] Load </usr/lib64/python3.3/site-packages/kivy/data/glsl/default.png>
[INFO              ] [Window      ] virtual keyboard not allowed, single mode, not docked
 Traceback (most recent call last):
   File "FlappyBird.py", line 160, in <module>
     FlappyBirdApp().run()
   File "/usr/lib64/python3.3/site-packages/kivy/app.py", line 766, in run
     root = self.build()
   File "FlappyBird.py", line 155, in build
     game = FlappyBirdGame()
   File "FlappyBird.py", line 101, in __init__
     self.mcnay.normal_velocity = [0, -4]
 AttributeError: 'NoneType' object has no attribute 'normal_velocity'

[vlinhart]

@livibetter have a look at my pull request, had the same issue as you, now it works with the patch

[undercase]

Sorry about that, it seems that on the latest Kivy build (the current Linux one), you can't make empty class-level Object Properties anymore.