max_size=20

app.py

@@ -91,7 +91,7 @@ with block:
         generate_button.click(fn=create_image, inputs=[image_pil,target,prompt,n_prompt,scale, guidance_scale,num_samples,num_inference_steps,seed], 
                                   outputs=[generated_image])
 
-block.launch(max_threads=10)
+block.launch(max_size=10)