cannot redeclare pluggable function


/* These functions can be replaced via plugins. They are loaded after plugins are loaded. */


if that’s the case then why am I getting this error when trying to activate:

Fatal error: Cannot redeclare get_currentuserinfo() (previously declared in /Applications/MAMP/htdocs/tisch/web/wordpress/wp-includes/pluggable.php:41) in /Applications/MAMP/htdocs/tisch/web/wordpress/wp-content/plugins/symfony-login.php on line 30