The Confluence dashboard is a fixed page, outside any spaces, it's not something you can throw away.
It is the default landing page as well - if someone just hits the base url for Confluence, they get pushed to the landing page. But you can change the landing page to be anything in your Confluence.
My guess here is that you have set your landing page to be something in a space rather than the dashboard, but someone has deleted that page.
It will be in the "trash" for the space in which the landing page was. Unless an admin has chosen to delete the entire space. Then you'll need to be thinking about restoring backups.
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