fix example error

app.py

@@ -57,7 +57,7 @@ IMAGE_PROCESS_TRANSFORM = transforms.Compose([
 ])
 
 @spaces.GPU
-def generate_image(ref_image, ref_image2=None, prompt="", height=512, width=512, num_steps=25, guidance_scale=3.5, seed=0, ip_scale=1.0):
+def generate_image(ref_image, prompt="", height=512, width=512, ref_image2=None, num_steps=25, guidance_scale=3.5, seed=0, ip_scale=1.0):
     print(f"ref_image: {ref_image.size if ref_image is not None else None}, "
           f"ref_image2: {ref_image2.size if ref_image2 is not None else None}, "
           f"prompt: {prompt}, height: {height}, width: {width}, num_steps: {num_steps}, guidance_scale: {guidance_scale}, ip_scale: {ip_scale}")
@@ -148,7 +148,7 @@ with gr.Blocks() as demo:
     # When the button is clicked, pass all inputs to generate_image
     generate_btn.click(
         fn=generate_image,
-        inputs=[ref_image, ref_image2, description, height_slider, width_slider, steps_slider, guidance_slider, ref_scale_slider],
+        inputs=[ref_image, description, height_slider, width_slider, ref_image2, steps_slider, guidance_slider, ref_scale_slider],
         outputs=output,
     )