default is wrong keyword, use value instead

app.py

@@ -30,10 +30,10 @@ with demo:
   
   with gr.Row():  
     input_seed = gr.Number(label="seed",value=0)
-    input_size = seed=gr.Number(default=256, label='size')
-    res=gr.Number(default=2, label='res')
-    n_octaves=gr.Number(default=2, label='n-octaves')
-    persistence=gr.Number(default=0.5, label='persistence')
+    input_size = seed=gr.Number(value=256, label='size')
+    res=gr.Number(value=2, label='res')
+    n_octaves=gr.Number(value=8, label='n-octaves')
+    persistence=gr.Number(value=0.5, label='persistence')
 
   with gr.Row():
     output_image = gr.outputs.Image(type="filepath", label='Output')