“Error in getting SID” when running Named user license count report [AX 2012]

staticvoid navax_findBadUserNames(Args _args)
{
    UserInfo                userInfo;
    container               con;
;   whileselect forUpdate userInfo
where   userInfo.Enable&&
                userInfo.AccountType!= UserAccountType::ADGroup
{
        con = SysUserLicenseMiner::getUserRoles([userInfo.Id, userInfo.company]);
if(conLen(con)==0)
{
            warning(strFmt("Userid: %1, username: %2", UserInfo.networkAlias, UserInfo.name));
}
}
}