Can't access full sitemap in dashboard...Help!

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Hi, I am trying to add a new link to the Auto-Nav so went into Dashboard/sitemap, but it shows: "You cannot access task permissions."

I then enabled the "advanced permission" and still the same...
Also checked the "Task Permissions", and got this: "You cannot access task permissions."

Now I am wondering what I have done wrong, because I think I do have access to the sitemap a few days ago.

Can anyone help? Thanks a lot.