What does the error message "There was an error updating the list" mean? I got it while trying to add someone to a new, private, list using twitter's web site with Safari.
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This is one of those generic error messages that are used to cover all sorts of issues.
It allows the website or web app to provide a level of abstraction so that users only need to know that something is up and to either wait a bit before they retry or follow-up with support or the developers.
It's deliberately vague because the user doesn't need to know the exact details of what's gone wrong which may include:
These things are usually temporary and retrying later usually will go through fine.
If not, then the error message will show more details or there will be a related post on the site or its blog to detail what's happening and/or why.