MC Mod won't work in Tekkit Classic

[dchl]

So I have a mod that I really would like to use on our Tekkit server... This is the mod link: http://www.minecraftforum.net/topic/1262805-152-key-and-code-lock-mod-v103/

It is a locked door mod... It works fine in Vanilla MC but I can't get it to work in Tekkit!!! PLEASE HELP! And yes, I used the 1.2.5 version!