If you mis-set your url under Admin -> Settings -> System Configuration, this can lead to your being unable to get into your admin panel due to the script expecting the admin panel to be located at a URL where it is not. You will therefore need to fix the mistake by editing your config.php. Toward the bottom of your config.php you should find a line

$dirurl = 'http://www.yoursite.com/wsnkb';

Alter the URL to make it correct, then save and upload and this will fix your problem.