when I click on the link for the posts http://www.telechargercours.com/post-sitemap.xml I receive an error

XML Parsing Error: not well-formed
Location: http://www.telechargercours.com/post-sitemap.xml
Line Number 14427, Column 34: <image:caption>L'Ordre SELECT Élémentaire</image:caption>

any idea about this error?

Re: WordPress SEO sitemap, XML Parsing Error: not well-formed 80 80

I suspect that the character you used for either the É or é is not in the UTF-8 character set.

Re: WordPress SEO sitemap, XML Parsing Error: not well-formed 80 80

As far as a solution, how about replacing those characters with the correct HTML entities?
É = &Eacute;
é = &eacute;
Source: http://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references

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