Update app.py

app.py

@@ -630,6 +630,7 @@ from langchain.chains import RetrievalQA
 from langchain.chains.conversation.memory import ConversationBufferWindowMemory
 from langchain.agents import Tool, initialize_agent
 from huggingface_hub import login
+from parler_tts import ParlerTTSForConditionalGeneration
 
 from transformers.models.speecht5.number_normalizer import EnglishNumberNormalizer
 from string import punctuation