Hi, it seems like you have tried to rename wp-admin path, and missed something there. Please do these to reset the plugin settings.
1) In “wp_options” table in your database, delete the rows with following “option_name”. Please backup your database first.
2) comment out or remove following line from wp-config.php (if you have added it there previously) define(“ADMIN_COOKIE_PATH”, “/NEW_WPADMIN_PATH_NAME”);
You shall now be able to login to backend, and can re-configure the plugin. And to change wp-admin path name you’ll need to follow the on-screen instructions very carefully.