Single_page error

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I made a littje mistake by trying to install a single page through the dashboard before i uploaded this page. After this i uploaded the page and tried to add it through the dashboard again. Now i get the following error: "That page has already been added." but the page is not in the list.

I solved it by renamimg the page and install it the right way but is there a way to get this pollution from the database?

Anyone???

DeWebmakers