Node Red Websocket Error

Did this ever work?
if it did, do you know what you changed?
Are you using HomeAutomation?
Can you create a small flow demonstrating the issue? If so please export it and paste it to a reply

You can start node-red with the --safe option node-red --safe and it won't run anything until you do a reply.

It looks like you have two dashboards installed - node-red-dashboard and node-red-contrib-polymer. If you look at the flow page for node-red-contrib-polymer you will see it is unmaintained and over three years old. I would suggest removing it.