fix small error

app.py

@@ -21,10 +21,11 @@ def text_to_image(prompt, image, client):
     return result
 
 with gr.Blocks() as demo:
+    client = gr.State(None)
     image = gr.Image()
     input_image = gr.Image(type="filepath")
     prompt = gr.Textbox(max_lines=1)
-    prompt.submit(text_to_image, [prompt, input_image], [image])
+    prompt.submit(text_to_image, [prompt, input_image, client], [image])
 
     # gr.Examples(
     #     examples=[