Update app.py

app.py

@@ -32,6 +32,7 @@ st.write("Analyze datasets using natural language queries.")
 # Initialize LLM
 llm = None
 
+
 # Model Selection
 model_choice = st.radio("Select LLM", ["GPT-4o", "llama-3.3-70b"], index=0, horizontal=True)
 
@@ -52,6 +53,9 @@ elif model_choice == "GPT-4o":
     else:
         llm = ChatOpenAI(api_key=openai_api_key, model="gpt-4o")
 
+if llm is None:
+    st.error("❌ LLM is not initialized. Please check your API keys and model selection.")
+
 # Initialize session state for data persistence
 if "df" not in st.session_state:
     st.session_state.df = None