That's a PHP parsing error.
Did you modify your .htaccess file to run .html documents as PHP?
The stats documents are XHTML and begin with the XML prologue and another XML processing instruction. If passed through PHP and short tags is on, PHP will try to parse these as PHP code.
From the online documentation:
So I'm thinking you either have a custom PHP build or php.ini file and you pass .html files through PHP from your .htaccess
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