Update app.py

app.py

@@ -5,7 +5,7 @@ from langchain.document_loaders import PyPDFLoader
 from langchain.embeddings import HuggingFaceInferenceAPIEmbeddings
 
 # Use Hugging Face Inference API embeddings
-inference_api_key = os.environ['hf']
+inference_api_key = os.environ['HF']
 api_hf_embeddings = HuggingFaceInferenceAPIEmbeddings(
     api_key=inference_api_key,
     model_name="sentence-transformers/all-MiniLM-l6-v2"