title: TypeError: __init__() got an unexpected keyword argument '__no_builder' Kivy
body: <p>I'm trying to add a <code>def __init__(self)</code> to my code and when I run the kivy program I get this:</p>
  
  <pre><code>Traceback (most recent call last):
     File "/Users/acrobat/Desktop/dive/test.py", line 78, in &lt;module&gt;
       ''')
     File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/lang.py", line 1921, in load_string
       self._apply_rule(widget, parser.root, parser.root)
     File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/lang.py", line 2085, in _apply_rule
       self._apply_rule(child, crule, rootrule)
     File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/kivy/lang.py", line 2082, in _apply_rule
       child = cls(__no_builder=False)
   TypeError: __init__() got an unexpected keyword argument '__no_builder'
  </code></pre>
  
  <p>Here is the code:
  The <code>def __init__(self)</code> is  in a <code>PlayerImage</code> Class which is a widget that I'm trying to move across the screen</p>
  
  <pre><code>class PlayerImage(Image):
      angle = NumericProperty(0)
  
      def __init__(self):
          super().__init__()
  
  
      def on_touch_down(self, touch):
          # self.currentstate = self.states["person.zip/"]
          Animation.cancel_all(self)
          angle = degrees(atan2(touch.y - self.center_y,
                                touch.x - self.center_x))
  
          Animation(center=touch.pos, angle=angle).start(self)
          # self.currentstate = self.states["personred/rest.png/"]
  </code></pre>
  
  <p>I'm not using a kv lang file so here is my build code:</p>
  
  <pre><code>root = Builder.load_string('''
  Widget:
      Widget:
          PlayerImage:
              source: './rpgArt/person.zip'
              allow_stretch: True
              keep_ratio: True
          PlayerImage2:
              source: './rpgArt/personred.zip'
              allow_stretch: True
              keep_ratio: True
  ''')
  </code></pre>
  
  <p><strong>EDIT</strong>: added kivy tag</p>