human
Solve the following python programming problem given the following code:
def build(self) : 
    available_shaders = (shader_pulse, shader_postprocessing, shader_monochrome) 
    self.shader_index = 0 
    root = FloatLayout () 
    sw = ShaderWidget () 
    root.add_widget (sw) 
    btn = Button (text = 'Hello world', size_hint = (None, None), pos_hint = { 
        'center_x' : 0.25, 
        'center_y' : 0.5, 
}) 
    sw.add_widget (btn) 
    center = (((Window.width * 0.75) - 256), ((Window.height * 0.5) - 256)) 
    scatter = ScatterImage (source = 'tex3.jpg', size_hint = (None, None), size = (512, 512), pos = available_shaders) 
    sw.add_widget (scatter) 
    btn = Button (text = 'Change fragment shader', size_hint = (1, None), height = 50) 
    def change(* largs) : 
        sw.fs = available_shaders [self.shader_index] 
        self.shader_index = ((self.shader_index + 1) % len (available_shaders)) 
btn.bind (on_release = change) 
    root.add_widget (btn) 
    return root 

    
    

    Fix the buggy line: scatter = ScatterImage (source = 'tex3.jpg', size_hint = (None, None), size = (512, 512), pos = available_shaders)
assistant
#Here is Python program to fix the buggy line: scatter = ScatterImage (source = 'tex3.

scatter = ScatterImage (source = 'tex3.jpg', size_hint = (None, None), size = (512, 512), pos = center)