Localhost:1880 connection refused

Console tab shows 3 errors:

Failed to load resource: the server responded with a status of 404 (Not Found) - http://localhost:3000/plugins/signalk-node-red/redapi/ui/socket.io/socket.io.js

Refused to execute script from 'http://localhost:3000/plugins/signalk-node-red/redapi/ui/socket.io/socket.io.js' because its MIME type ('text/html') is not executable, and strict MIME type checking is enabled. - http://localhost:3000/plugins/signalk-node-red/redapi/ui/

ReferenceError: io is not defined
    at angular.module.service.connect (app.min.js:606:145)
    at Object.<anonymous> (app.min.js:605:5924)
    at Object.invoke (app.min.js:66:264)
    at S.instance (app.min.js:120:161)
    at p (app.min.js:94:161)
    at g (app.min.js:87:186)
    at app.min.js:86:311
    at app.min.js:43:199
    at m.$eval (app.min.js:177:180)
    at m.$apply (app.min.js:177:423)
- http://localhost:3000/plugins/signalk-node-red/redapi/ui/js/app.min.js