Update app.py

app.py

@@ -137,7 +137,7 @@ async def rollback_last(
     ppm = res[idx]
     ppm.replace_last_pong(response_txt)
     
-    return "", "", ppm.build_uis(), str(res), gr.update(interactive=True), "off"
+    return "", ppm.build_uis(), str(res), gr.update(interactive=True), "off"
 
 def reset_chat(idx, ld, state, palm_if):
     res = [state["ppmanager_type"].from_json(json.dumps(ppm_str)) for ppm_str in ld]