modify secret key

app.py

@@ -11,7 +11,7 @@ import os
 query = st.text_input("Ask a question: ")
 @st.cache_resource
 def llm():
-    return HuggingFaceHub(repo_id="google/flan-t5-small", model_kwargs={"temperature":0,"max_length":200}, huggingfacehub_api_token=st.secrets("API_TOKEN")) # type: ignore
+    return HuggingFaceHub(repo_id="google/flan-t5-small", model_kwargs={"temperature":0,"max_length":200}, huggingfacehub_api_token=os.environ("API_TOKEN")) # type: ignore
 @st.cache_resource
 def qa(query):
     pdf_folder_path = "./PDFfiles"