Multiple nodes with the same URL ‘/amsV1/analysis/PupilGrades.aspx’ were found. XmlSiteMapProvider requires that sitemap nodes have unique URLs.

Solution

You might want to look into the layouts.sitemap XML file in the C:\inetpub\wwwroot\wss\VirtualDirectories\<port>\_app_bin directory. In that path look in the layouts.sitemap file. This file should contain multiple entries for the pages in question.

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