Update app.py

app.py

@@ -10,12 +10,19 @@ from langchain.prompts import ChatPromptTemplate, MessagesPlaceholder
 from transformers import AutoTokenizer, AutoModelForCausalLM, BitsAndBytesConfig, pipeline
 
 import os
+from dotenv import load_dotenv
 from huggingface_hub import login
 
-# Authenticate using your Hugging Face token stored as 'SP_7'
-hf_token = os.getenv("SP_7")  # Reads the token from the environment variable
+# Load environment variables from the .env file
+load_dotenv()
+
+# Read the Hugging Face token
+hf_token = os.getenv("SP_7")
 if hf_token is None:
-    raise ValueError("Hugging Face token 'SP_7' is not set in the environment variables.")
+    raise ValueError(
+        "Hugging Face token 'SP_7' is not set in the environment variables. "
+        "Ensure it is defined in the .env file."
+    )
 
 # Log in to Hugging Face
 login(token=hf_token)