keys error handling added

app.py

@@ -24,9 +24,12 @@ load_dotenv()
 """
 We will load our environment variables here.
 """
-HF_LLM_ENDPOINT = os.environ["HF_LLM_ENDPOINT"]
-HF_EMBED_ENDPOINT = os.environ["HF_EMBED_ENDPOINT"]
-HF_TOKEN = os.environ["HF_TOKEN"]
+try:
+    HF_LLM_ENDPOINT = os.environ['HF_LLM_ENDPOINT']
+    HF_EMBED_ENDPOINT = os.environ['HF_EMBED_ENDPOINT']
+    HF_TOKEN = os.environ['HF_TOKEN']
+except KeyError as e:
+    raise EnvironmentError(f"Missing environment variable: {e}")
 
 # ---- GLOBAL DECLARATIONS ---- #