Update

app.py

@@ -179,8 +179,8 @@ with gr.Blocks(css=css) as demo:
                 examples=[
                     {
                         "background": path,
-                        "layers": None,
-                        "composite": None,
+                        "layers": [],
+                        "composite": path,
                     }
                     for path in Path("./examples/scenes").glob("*.png")
                 ],