No Rooms and Music visible

[parduhn]

Hi,
I get on start server/ npm run-script dev below error. On client no rooms and an favourites and libraries are visible (500: Cannot read property 'browse' of null)
I am using only first generation of Sonos devices: Version 11.2.4

(node:28389) UnhandledPromiseRejectionWarning: Error: Not A Sonos Device
at new MusicLibrary (/data/home/.../sonos-web/server/src/sonos/MusicLibrary.js:14:30)
at /data/home/.../sonos-web/server/src/sonos/SonosNetwork.js:49:29
at processTicksAndRejections (internal/process/task_queues.js:97:5)
(node:28389) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:28389) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.