title: I am trying to display an image using python and kivy in a popup window but I get this error and I don't know how to fix it
body: <p>I am trying to display an image using python and kivy in a popup window but I get this error and I don't know how to fix it.<br>
  If I put the path manually it works but also if I print it it's the same and I cast it in string as it's required.</p>
  
  <pre><code>class TestApp(App):
  
      def build(self):
          if sys.platform == 'win':
              user_path = dirname(expanduser('~')) + sep + 'Documents'
          else:
              user_path = expanduser('~') + sep + 'Documents'
          browser = FileBrowser(select_string='Select',
                                favorites=[(user_path, 'Documents')])
          browser.bind(
                      on_success=self._fbrowser_success,
                      on_canceled=self._fbrowser_canceled)
          return browser
  
      def _fbrowser_canceled(self, instance):
          TestApp.stop(self)
  
      def _fbrowser_success(self, instance):
          path = str(instance.selection).strip('[]')
  
          content = Image(source = path)
          popup = Popup(content=content, auto_dismiss=False)
          content.bind(on_press=popup.dismiss)
  
          popup.open()
  
  TestApp().run()
  </code></pre>
  
  <p><code>#[ERROR  ] [Image       ] Error reading file 'C:\\...'.</code></p>