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Just ran a dev build, selected it from the dev alpha AU server, and restarted as prompted. Thrown on console only.
Created attachment 12522 [details] Stack trace
Same thrown (not just on console, in dialog) whenever you try to add a bookmark.
Do you have core/naming module present?
Yes, see first two lines in log excerpt. It might be an obsolete version, I don't know, but if so you should make sure bookmarks depends on a newer version and that that version gets published on dev alpha daily AU (just update spec version - it is in nbbuild/build.properties:${config.modules.daily-alpha-nbms}).
I have increased the spec version of both contrib/bookmarks and core/naming. I have made the dependency in the bookmarks on the version of naming. Since I have no way to verify this now please feel free to reopen if there is still some problem. On my local build here everything works normally.