'Show a error Message Bubble.'

def show_error(self, error, width='200dp', pos=None, arrow_pos=None, exit=False, icon='atlas://gui/kivy/theming/light/error', duration=0, modal=False):

    self.show_info_bubble(text=error, icon=icon, width=width, pos=(pos or Window.center), arrow_pos=arrow_pos, exit=exit, duration=duration, modal=modal)
