Update app.py

app.py

@@ -15,9 +15,9 @@ def set_openai_api_key(api_key: str):
     """
     if api_key:
         os.environ["OPENAI_API_KEY"] = api_key
-        chain = get_chain(vectorstore)
         embeddings = OpenAIEmbeddings()
         vectorstore = FAISS.load_local('saved_model/vector.db',embeddings)
+        chain = get_chain(vectorstore)
         os.environ["OPENAI_API_KEY"] = ""
         return chain