Update app.py

app.py

@@ -104,7 +104,7 @@ with demo:
     btn_get_tree.click(
         fn=genFlatDepthTree, 
         inputs=input_expr, 
-        outputs=[out_image_tree, out_flat_tree])
+        outputs=[out_image_tree, out_flat_tree]
     )
 
 demo.queue(concurrency_count=10)