This should be posted on the original thread, not the help section.
But asides from that, you obviously havnt followed the readme, as they would be working, i use them myself and there is no glitch or error with them.
Ensure you put the coding in the marking file in the feral heart folder.
Also make sure that the .png images are in the textures folder.
If it still dosnt work, then it's something that you're missing out x3