title: Python - Kivy: AttributeError: 'super' object has no attribute '__getattr__' when trying to get self.ids
body: <p>I wrote a code for a kind of android lock thing, whenever I try to get an specific ClickableImage using the id it raises the following error:</p>
  
  <pre><code>AttributeError: 'super' object has no attribute '__getattr__'
  </code></pre>
  
  <p>I've spent hours trying to look for a solution for this problem, I looked other people with the same issue, and people told them to change the site of the builder, because it needed to be called first to get the ids attribute or something like that, but everytime I move the builder, it raises the error "class not defined". Any clues?</p>
  
  <p>Here is my code:</p>
  
  <pre><code>from kivy.app import App
  from kivy.config import Config
  from kivy.lang import Builder
  from kivy.graphics import Line
  from kivy.uix.screenmanager import ScreenManager, Screen
  from kivy.uix.widget import Widget
  from kivy.uix.image import Image
  from kivy.uix.floatlayout import FloatLayout
  from kivy.uix.behaviors import ButtonBehavior
  
  #Variables
  cords = ()
  bld = Builder.load_file('conf.kv')
  
  class Manager(ScreenManager): pass
  class Principal(Screen): pass
  
  class ClickableImage(ButtonBehavior, Image):
      def on_press(self):
          self.source = 'button_press.png'
  
      def on_release(self):
          self.source = 'button.png'
          self.ids.uno.source = 'button_press.png'
  
  class canva(Widget):
      def on_touch_down(self, touch):
          global cords
          with self.canvas:
              touch.ud['line'] = Line(points=(touch.x, touch.y), width=1.5)
          cords = (touch.x, touch.y)
  
      def on_touch_move(self,touch):
          global cords
           touch.ud['line'].points = cords + (touch.x, touch.y)
  
      def on_touch_up(self,touch):
          self.canvas.clear()
  
  class Api(App):    
      def build(self):
          return bld
  
  if __name__ == '__main__':
      Api().run()
  </code></pre>
  
  <p>and here is my .kv file:</p>
  
  <pre><code># conf to file:  test.py
  
  &lt;Manager&gt;:
      Principal:
  
  &lt;Principal&gt;:
      GridLayout:
          size_hint_x: 0.5
          size_hint_y: 0.6
          width: self.minimum_width
          cols: 3
          ClickableImage:
              id: 'uno'
              size: 10,10
              source: 'button.png'
              allow_strech: True
          ClickableImage:
              id: 'dos'
              size: 30,30
              source: 'button.png'
              allow_strech: True
      canva:
  </code></pre>