Where's Node-Red in OP2

[oliver32_de]

My problem goes further: I installed the webapp, startet it, but got an error message in a new browser: Cannot GET /redAdmin

Signal K dashboard shows an error in connection/plugin status:
@signalk/signalk-node-red       Failed to start: Cannot find module 'moment'
   

I installed grafana and that is on port 3000. Maybe this interferes somehow. But nodered does not start even if grafana server does not run.

Can anybody please give me a hint.

Thank you all in advance

Oliver