king login problems

anyone use the king login? getting this error

Fatal error: Call to undefined function wp_get_current_user() in C:\xampplite\htdocs\wordpress\wp-includes\capabilities.php on line 446

Anyone know whats going on? I installed as per the instructions but the only thing that is odd is that my widgets.php file is in wp-includes folder and it says above to put the king php file in the plugins folder with the widgets.php, but it isn’t in that folder.