update btn input

app.py

@@ -31,5 +31,5 @@ def draw():
 with gr.Blocks() as demo:
     result = draw()
     draw_btn = gr.Button("Draw")
-    draw_btn.click(fn=draw, inputs="", outputs=result)
+    draw_btn.click(fn=draw, inputs=[], outputs=result)
 demo.launch()