3.7.1 PHP Warning – Use of undefined constant

In line 41 of janolaw_agb.php you use:
add_options_page('Janolaw AGB Hosting', 'Janolaw AGB Hosting', administrator, basename(__FILE__), 'janolaw_plugin_options');

The third parameter has to be a string. In this version (3.7.1) I see the warning: Use of undefined constant administrator.