Update app.py

app.py

@@ -24,7 +24,7 @@ def save_history(history, user_id):
     with open(filename, 'w', encoding='utf-8') as f:
         json.dump(history, f, ensure_ascii=False, indent=2)
 
-def load_history(user_id):
+def load_history(history, user_id):
     filename = get_history_filename(user_id)
     if os.path.exists(filename):
         with open(filename, 'r', encoding='utf-8') as f: