You can’t run both add-ons at the same time. The warning is about the core Z-Wave JS add-on. Running both at the same time will result in one of them failing. From the info provided we don’t know which one you are actually using with HA. Check the Server URL in the integration settings panel. If it’s pointing to core, following the migration guide. If it’s pointing to the add-on, delete the core add-on.