Ошибка при запуске калькулятора (графического)

Question

решил сделать графический калькулятор на питоне с помощью kivy вот этот код:

class CalApp(App):
    def build(self):
        gl = GridLayout(cols = 4)

        gl.add_widget( Button(text = '0') )
        gl.add_widget( Button(text = '0') )
        gl.add_widget( Button(text = '0') )
        gl.add_widget( Button(text = '0') )
        gl.add_widget( Button(text = '0') )
        gl.add_widget( Button(text = '0') )
        gl.add_widget( Button(text = '0') )
        gl.add_widget( Button(text = '0') )

        gl.add_widget( Button(text = '0') )
        gl.add_widget( Button(text = '0') )
        gl.add_widget( Button(text = '0') )
        gl.add_widget( Button(text = '0') )

        gl.add_widget( Widget()  )
        gl.add_widget( Button(text = '0') )
        gl.add_widget( Button(text = '0') )
        gl.add_widget( Button(text = '0') )


        return gl 

if __name__ == '__main__':
    CalApp().run()

выходит ошибка:

Unable to get a Window, abort

все библиотеки я уже подключил (если проблема в них скажите что надо сделать, скачать)

вот сама ошибка: """ [INFO ] [Logger ] Record log in C:\Users\Eduird.kivy\logs\kivy_20- 04-10_36.txt [INFO ] [deps ] Successfully imported "kivy_deps.gstreamer" 0.1.18 [INFO ] [deps ] Successfully imported "kivy_deps.angle" 0.1.10 [INFO ] [deps ] Successfully imported "kivy_deps.glew" 0.1.12 [INFO ] [deps ] Successfully imported "kivy_deps.sdl2" 0.1.23 [INFO ] [Kivy ] v1.11.1 [INFO ] [Kivy ] Installed at "C:\Users\Eduird\AppData\Local\Programs\Python\Python37\lib\site- packages\kivy__init__.py" [INFO ] [Python ] v3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:59:51) [MSC v.1914 64 bit (AMD64)] [INFO ] [Python ] Interpreter at " C:\Users\Eduird\AppData\Local\Programs\Python\Python37\python.exe" [INFO ] [Factory ] 184 symbols loaded [INFO ] [Image ] Providers: img_tex, img_dds, img_sdl2, img_gif (img_pil, img_ffpyplayer ignored) [INFO ] [Text ] Provider: sdl2 [INFO ] [Window ] Provider: sdl2 [INFO ] [GL ] Using the "OpenGL" graphics system [CRITICAL] [Window ] Unable to find any valuable Window provider.
Please enable debug logging (e.g. add -d if running from the command line, or change the log level in the config) and re-run your app to identify potential causes sdl2 - ValueError: angel_sd12 is not a recognized GL backend File "C:\Users\Eduird\AppData\Local\Programs\Python\Python37\lib\site- packages\kivy\core__init__.py", line 71, in core_select_lib cls = cls() File "C:\Users\Eduird\AppData\Local\Programs\Python\Python37\lib\site- packages\kivy\core\window\window_sdl2.py", line 152, in init super(WindowSDL, self).init() File "C:\Users\Eduird\AppData\Local\Programs\Python\Python37\lib\site- packages\kivy\core\window__init__.py", line 981, in init self.create_window() File "C:\Users\Eduird\AppData\Local\Programs\Python\Python37\lib\site- packages\kivy\core\window\window_sdl2.py", line 312, in create_window super(WindowSDL, self).create_window() File "C:\Users\Eduird\AppData\Local\Programs\Python\Python37\lib\site- packages\kivy\core\window__init__.py", line 1254, in create_window self.initialize_gl() File "C:\Users\Eduird\AppData\Local\Programs\Python\Python37\lib\site- packages\kivy\core\window__init__.py", line 1225, in initialize_gl ignored=self.gl_backends_ignored) File "C:\Users\Eduird\AppData\Local\Programs\Python\Python37\lib\site- packages\kivy\core\gl__init__.py", line 38, in init_gl gl_init_symbols(allowed, ignored) File "kivy\graphics\opengl.pyx", line 1556, in kivy.graphics.opengl.gl_init_symbols Kile "kivy\graphics\cgl.pyx", line 97, in kivy.graphics.cgl.cgl_init

[CRITICAL] [App         ] Unable to get a Window, abort.

"""

БЛОГ НА HUSL

Ошибка при запуске калькулятора (графического)

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