Sitemap problem with link page disappeared and replaced by "page not found"

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Hi,

On the sitemap of the dashboard of Concrete5 (index.php/dashboard/sitemap/full/), i wanted to "copy" a menu tab which display a bad drop down item by creating a new one with the same name.

I created a tab with a new page or i have also the possibility with a new link and I deleted the wrong menu tab. But when i go in the new tab the link of direction is wrong and display "page not found" !

I thought i only removed the tab/text and not the page. How could i get back my page?

Thanks all !