Web Part XSLT errors

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Unable to display this Web Part. To troubleshoot the problem, open this Web page in a Windows SharePoint Services-compatible HTML editor such as Microsoft Office SharePoint Designer. If the problem persists, contact your Web server administrator.

This is a XSLT error.

The question is, is it a sintax error or is the query unable to retrieve the data?

- Enable custom errors and open the page with SharePoint designer to look for XSLT errors

- Add the existing URL to alternate access mappings in central admin (edit public URL) if you're using a secondary/external URL

http://blogs.msdn.com/sharepoint/archive/2007/03/06/what-every-sharepoint-administrator-needs-to-know-about-alternate-access-mappings-part-1.aspx

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