Error message “An unexpected error has occurred” when using the IIS Search Engine Optimization (SEO) Toolkit

Recently when creating a site analysis with the IIS Search Engine (SEO) Toolkit for this page, an error occurred:

An unexpected error has occurred.
Error details: “System.ArgumentException: An entry with the same key already exists.
at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at System.Collections.Generic.SortedList`2.Add(TKey key, TValue value)
at Microsoft.Web.Management.SEO.Crawler.XmlCrawlerReportProvider.XmlCrawlerReport.GetProperty(String name)
at Microsoft.Web.Management.SEO.Crawler.UrlInfo.SetPropertyValue(String name, Object value)
at Microsoft.Web.Management.SEO.Crawler.Parsers.HtmlLinkParser.GetLinksInternal(CrawlerProcessContext result, Uri baseUri, String text, CrawlerSettings settings, Boolean isSnippet, Boolean& noIndex)”.

Until now, I am not aware of a resolution for the error. My assumption is that some content on the page is ambigous.

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