title: kivy android AttributeError: 'NoneType' object has no attribute 'play'
body: <pre><code>import kivy
  from kivy.app import App
  from kivy.uix.button import Label
  from kivy.core.audio import SoundLoader
  
  class HelloApp(App):
      def build(self):
          self.sound = SoundLoader.load('back.mp3') # open the background music
          self.sound.play() # play the sound
          return Label(text='&gt;&gt;&gt;&gt;&gt;')
  if __name__==&quot;__main__&quot;:
      HelloApp().run()
  </code></pre>
  <p>this is my code it works fine on linux
  but when i try to make apk by buildozer
  the app crashes upon start
  and the logcat command gives this</p>
  <p>[WARNING] [Audio       ] Unable to find a loader for &lt;back.mp3&gt;
  :  Traceback (most recent call last):
  :    File &quot;/home/moh/audio2/.buildozer/android/app/main.py&quot;, line 15, in 
  :    File &quot;/home/moh/audio2/.buildozer/android/platform/build-armeabi-v7a/build/python-installs/myapp/kivy/app.py&quot;, line 829, in run
  File &quot;/home/moh/audio2/.buildozer/android/app/main.py&quot;, line 9, in build
  AttributeError: 'NoneType' object has no attribute 'play'
  Python for android ended.</p>