Get Role Name

Hi, I am not an expert on JAVA by any means, but I found a script that brings the current user role(s), inside this script there is a line with the following text GetRoleName of the current role, when I execute this script I get the following error:

Field: the_field_I_am_using

event: onchange

Error: 'getRoleName' is undefined

 

The script is supposed to work, since I found it everywhere on the internet and no one seems to have an issue with the GetRoleName.  Any clues what I am missing here?  This is the simple java function I am using

 

function CheckUserRole() {

    var currentUserRoles = Xrm.Page.context.getUserRoles();

    for (var i = 0; i < currentUserRoles.length; i++) {

         var userRoleId = currentUserRoles[i];

    var userRoleName = getRoleName(userRoleId);

    alert (userRoleName)

}

}