bugfix: fix minor bugs

utils/completion_reward.py

@@ -321,6 +321,8 @@ class AWSAgent:
 
 class GoogleAgent:
     def get_story(self, user_log):
+        SERVICE_ACCOUNT_INFO = os.getenv("GBQ_TOKEN")
+        service_account_info_dict = json.loads(SERVICE_ACCOUNT_INFO)
         aiplatform.init(
             project='junyiacademy',
             service_account=service_account_info_dict,