It won't work if they already have a RscTitles class defined, you can't define the same class twice.. So maybe you simply didn't have one defined to begin with, yet the other guy did. The op needs to change the instructions to include different steps for people who may already have a RscTitles class .. I'm surprised the op doesn't already know this!
So for those who are still stuck... If you already have a RscTitles class in your description file, then simply cut and paste the following code right after your existing class RscTitles { ...
class wm_disp {
idd = -1;
onLoad = "uiNamespace setVariable ['wm_disp', _this select 0]";
fadein = 0;
fadeout = 0;
duration = 10e10;
controlsBackground[] = {};
objects[] = {};
class controls {
class wm_text2 {
idc = 1;
x = safeZoneX+0.027;//safeZoneW*0.01;
y = safeZoneY+safeZoneH-0.16;
w = 1.151*safeZoneH;
h = 0.057*safeZoneH;
shadow = 2;
class Attributes
{
font = "EtelkaNarrowMediumPro";
color = "#24FFFFFF";
align = "left"; // put "center" here if you want some background
valign = "middle";
shadow = 2;
};
colorBackground[] = { 1, 0.3, 0, 0 }; // uncomment and increase 4th number to have a background
font = "EtelkaNarrowMediumPro";
size = 0.06*safeZoneH;
type = 13;
style = 0;
text="";
};
};
};
I hope that is a bit more helpful than some of the comments on here :)