Page not found (error 404)

The page http://paneinattesa.altervista.org/index.php?option=com_k2&view=itemlist&task=user&id=47515%25D0%25B7%25D0%25BA%25D0%25B4+2+%25D1%2581%25D0%25B5%25D0%25B7%25D0%25BE%25D0%25BD+4+%25D1%2581%25D0%25B5%25D1%2580%25D0%25B8%25D1%258F+%25D0%25B7%25D0%25BA%25D0%25B4+2+%25D1%2581%25D0%25B5%25D0%25B7%25D0%25BE%25D0%25BD%25D0%25B7%25D0%25BA%25D0%25B4+2+%25D1%2581%25D0%25B5%25D0%25B7%25D0%25BE%25D0%25BD was not found on this server.

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http://site.altervista.org/Page.html is different from http://site.altervista.org/page.html