How do I find errors in a XML file?
XML Tools, a plugin for Notepad++ allows you to check if the XML syntax is broken and tells you on what line the error is.
To install the XML tools plugin, download the plugin zip file, and extract the contents to where you have installed Notepad++ (such as C:\Program Files\Notepad++). Then restart Notepad++, open the XML file you wish to check, click on the "Plugins" menu at the top, select "XML Tools" and click on "Check XML syntax now."
Hope that helps.
You could even open it in firefox, and if it is malformed it will show you where the error lies.