Update app.py

app.py

@@ -497,7 +497,7 @@ with col2:
         st.rerun()
 with col3:
     if st.button("💬 Start WhatsApp Bot", disabled=not st.session_state.app_started or st.session_state.bot_started, use_container_width=True):
-        if not all([twilio_account_sid_to_use, twilio_auth_token_to_use, twilio_conversation_service_sid_to_use, twilio_bot_whatsapp_identity_to_use]):
+        if not all([twilio_account_sid_to_use, twilio_auth_token_to_use, twilio_bot_whatsapp_identity_to_use]):
             st.error("Twilio Account SID, Auth Token, Conversation Service SID, and Bot WhatsApp Identity are all required.")
         else:
             st.session_state.twilio_client = initialize_twilio_client(twilio_account_sid_to_use, twilio_auth_token_to_use)