changed the groq model name

app.py

@@ -1,7 +1,7 @@
 import os
 import validators
 import streamlit as st
-from langchain.prompts import PromptTemplate
+from langchain_core.prompts import PromptTemplate
 from langchain_groq import ChatGroq
 from langchain.chains.summarize import load_summarize_chain
 from langchain_community.document_loaders import PyPDFLoader
@@ -46,7 +46,7 @@ refinement_prompt = PromptTemplate(
 # Initialize LLM
 if groq_api_key:
     try:
-        llm = ChatGroq(model="openai/gpt-oss-120b", groq_api_key=groq_api_key)
+        llm = ChatGroq(model="llama-3.3-70b-versatile", groq_api_key=groq_api_key)
     except Exception as e:
         st.error(f"Failed to initialize Groq client: {e}")
         llm = None