When trying to export one of our webs we get this error:

An error occurred: ExportSite.ErrorSkinFoldersCopy Original exception: Error calling [msvcrt.dll]:_wmkdir(S:\Laura\athleticsdev\CMSSiteUtils\Export\tmp), error code: -1
Stack trace: at CMS.ImportExport.ExportProvider.CopySkinFolders(String siteName, String path) at SiteManager_Sites_Export_ExportSite.ButtonOK_Click(Object sender, EventArgs e)

Any ideas? Thanks.