Bluetooth seems not to work

[sirmoon137]

Hello I get in log the error

Nov 13 23:39:45 moonbike systemd[1]: Stopped kettler.service.
Nov 13 23:39:45 moonbike systemd[1]: Started kettler.service.
Nov 13 23:39:49 moonbike Kettler[17785]: module.js:549
Nov 13 23:39:49 moonbike Kettler[17785]: throw err;
Nov 13 23:39:49 moonbike Kettler[17785]: ^
Nov 13 23:39:49 moonbike Kettler[17785]: Error: Cannot find module '@abandonware/bleno'
Nov 13 23:39:49 moonbike Kettler[17785]: at Function.Module._resolveFilename (module.js:547:15)
Nov 13 23:39:49 moonbike Kettler[17785]: at Function.Module._load (module.js:474:25)
Nov 13 23:39:49 moonbike Kettler[17785]: at Module.require (module.js:596:17)
Nov 13 23:39:49 moonbike Kettler[17785]: at require (internal/module.js:11:18)
Nov 13 23:39:49 moonbike Kettler[17785]: at Object. (/home/pi/KettlerUSB/BLE/kettlerBLE.js:1:77)
Nov 13 23:39:49 moonbike Kettler[17785]: at Module._compile (module.js:652:30)
Nov 13 23:39:49 moonbike Kettler[17785]: at Object.Module._extensions..js (module.js:663:10)
Nov 13 23:39:49 moonbike Kettler[17785]: at Module.load (module.js:565:32)
Nov 13 23:39:49 moonbike Kettler[17785]: at tryModuleLoad (module.js:505:12)
Nov 13 23:39:49 moonbike Kettler[17785]: at Function.Module._load (module.js:497:3)
Nov 13 23:39:49 moonbike systemd[1]: kettler.service: Main process exited, code=exited, status=1/FAILURE
Nov 13 23:39:49 moonbike systemd[1]: kettler.service: Failed with result 'exit-code'.
Nov 13 23:39:49 moonbike systemd[1]: kettler.service: Service RestartSec=100ms expired, scheduling restart.
Nov 13 23:39:49 moonbike systemd[1]: kettler.service: Scheduled restart job, restart counter is at 104.
Nov 13 23:39:49 moonbike systemd[1]: Stopped kettler.service.
Nov 13 23:39:49 moonbike systemd[1]: Started kettler.service.