one more oops

app.py

@@ -399,7 +399,7 @@ def set_openai_api_key(api_key):
     #     return chain, express_chain, llm
     # return None, None, None
 
-    os.environ["OPENAI_API_KEY"] = OPENAI_API_KEY
+    os.environ["OPENAI_API_KEY"] = api_key
     llm = OpenAI(temperature=TEMPERATURE, max_tokens=MAX_TOKENS)
     chain, express_chain = load_chain(TOOLS_DEFAULT_LIST, llm)