Update app.py

app.py

@@ -12,7 +12,7 @@ from htmlTemplates import css, bot_template, user_template
 from langchain.llms import HuggingFaceHub
 
 # set this key as an environment variable
-HUGGINGFACEHUB_API_TOKEN=os.environ["huggingface_token"]
+HUGGINGFACEHUB_API_TOKEN=os.environ["HUGGINGFACEHUB_API_TOKEN"]
 
 def get_pdf_text(pdf_docs : list) -> str:
     text = ""