bugfix: fix minor bugs

utils/completion_reward.py

@@ -171,14 +171,14 @@ class CompletionReward:
             f"Player {insert_row['player_backend_user_id']} rendered successfully."
         )
 
-        with open("../data/completion_reward_issue_status.json") as f:
+        with open("./data/completion_reward_issue_status.json") as f:
             completion_reward_issue_status_dict = json.load(f)
 
         completion_reward_issue_status_dict[
             insert_row["player_backend_user_id"]
         ] = self.player_certificate_url
 
-        with open("../data/completion_reward_issue_status.json", "w") as f:
+        with open("./data/completion_reward_issue_status.json", "w") as f:
             json.dump(completion_reward_issue_status_dict, f)
 
     def upload_blob_and_get_public_url(
@@ -319,14 +319,13 @@ class AWSAgent:
 
 class GoogleAgent:
     def get_story(self, user_log):
-        credentials, _ = auth.default()
-        credentials.refresh(Request())
+        creds.refresh(Request())
 
         url = f"https://us-central1-aiplatform.googleapis.com/v1/projects/junyiacademy/locations/us-central1/publishers/google/models/gemini-pro:streamGenerateContent?"
 
         # Headers
         headers = {
-            "Authorization": f"Bearer {credentials.token}",
+            "Authorization": f"Bearer {creds.token}",
             "Content-Type": "application/json",
         }
         system_prompt = """