I fix it. Problem is in the file wp-content/plugins/ciusan-register-login/ciusan-register-login.php.
Line: 87
Replace it:
wp_localize_script( 'ajax-auth-script', 'ajax_auth_object', array(
With:
wp_localize_script( 'ciusan-register-login', 'ajax_auth_object', array(
