fix get helper bug

src/utils/llms_api.py

@@ -37,7 +37,7 @@ class APIHelper(object):
         self.generator = self.get_helper()
         self.prompt = Prompt(get_dir(config.ARTICLE.summarizing_prompt))
 
-    def get_helper():
+    def get_helper(self):
         MODEL_TYPE = os.environ["MODEL_TYPE"]
         MODEL_NAME = os.environ["MODEL_NAME"]
         MODEL_API_KEY = os.environ["MODEL_API_KEY"]