How did you install node-red?
Which version of node-red are you using?
Please post the rest of the startup log, that will give us some extra information about your environment. When posting it use the technique in this link so the forum does not mess with it. How to share code or flow json
[Edit] I think I may see the issue. Have you changed the user running node-red? The user needs to be in the sudo group.
[Further Edit] The user running node-red doesn't need to be in the sudo group if you don't want that, it is the user running node-red-start that needs to be able to use sudo. If you think the user does have sudo rights then what does the command
groups
show?
