gs.getUser().isMember is not working in script include

Hi Folks,

Good Morning...

i have created one script include, which is using in advanced reference qualifier. i am check gs.getUser().isMember in script include but it is not working. please find my script below.

var filterUsersList = Class.create();
filterUsersList.prototype = Object.extendsObject(AbstractAjaxProcessor, {
filterUser: function() {
var grpList = '';
var custAccount = current.u_account;
if (gs.getUserID().isMemberOf('n') || gs.getUserID().hasRole('admin')) {
if (custAccount != '') {
gs.info("Logged in user"+gs.getUserID());
var users = new GlideRecord('sys_user');
var qc = users.addQuery('company', custAccount);
qc.addOrCondition('company', '54cffe00db66fb4092b6c9fb0b9619a3');
users.query();
while (users.next()) {
grpList += (',' + users.sys_id);

}
}
return 'sys_idIN' + grpList;
}

this script is i have check with client callable.

Thanks,

Mohan.