Parse error on activation

Hi,

When I try to activate your plugin on my WP3.5.2, I get this error :

Parse error: syntax error, unexpected T_STRING in /var/www/vhosts/1vin1medaille.com/httpdocs/newwp/wp-admin/includes/upgrade.php on line 1751

I have desactivate all my plugin with the same result.

Any idea ?

Thanks.

http://wordpress.org/extend/plugins/personal-statistics-for-authors/