我一直收到此错误：无法找到任何有价值的Window提供程序。带有kivy继承人的“完整”错误：

[INFO   ] [Logger      ] Record log in C:\Users\Victor\.kivy\logs\kivy_17-
05-27_10.txt
[INFO   ] [Kivy        ] v1.10.0
[INFO   ] [Python      ] v3.6.1 (v3.6.1:69c0db5, Mar 21 2017, 17:54:52) [MSC 
v.1900 32 bit (Intel)]
[INFO   ] [Factory     ] 194 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_pil, img_gif 
(img_sdl2, img_ffpyplayer ignored)
[INFO   ] [Text        ] Provider: pil(['text_sdl2'] ignored)
[CRITICAL] [Window      ] Unable to find any valuable Window provider.
sdl2 - ImportError: DLL load failed: The specified module could not be 
found.
File "C:\Users\Victor\Desktop\lib\site-packages\kivy\core\__init__.py", line 
59, in core_select_lib
fromlist=[modulename], level=0)
File "C:\Users\Victor\Desktop\lib\site-
packages\kivy\core\window\window_sdl2.py", line 26, in <module>
from kivy.core.window._window_sdl2 import _WindowSDL2Storage

[CRITICAL] [App         ] Unable to get a Window, abort.
Exception ignored in: 'kivy.properties.dpi2px'
Traceback (most recent call last):
File "C:\Users\Victor\Desktop\lib\site-packages\kivy\utils.py", line 496, in __get__
 retval = self.func(inst)
 File "C:\Users\Victor\Desktop\lib\site-packages\kivy\metrics.py", line 174, in dpi
 EventLoop.ensure_window()
 File "C:\Users\Victor\Desktop\lib\site-packages\kivy\base.py", line 127, in ensure_window
 sys.exit(1)
 SystemExit: 1
[CRITICAL] [App         ] Unable to get a Window, abort.

多数民众赞成在错误和继承人的代码：

import kivy #added this just in case
from kivy.app import App
from kivy.uix.label import Label


class SimpleKivy(App):
    def build(self):
       return Label(text="Hello World!!!")

if __name__ == "__main__":
   SimpleKivy().run()

有人可以解释这个错误