Does Ox47 spell the end of the world (for this site)?

Client's site been down since 2/27/14. Receiving SITE ERROR message: Ox47 with text making reference to "Server Error." When I visit Website Manager, all of my other client sites appear in the pulldown menu, including the one that is down. But unlike the other sites, the one that is down does not show an index page icon. Any ideas?

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