RSBinTool Error. Again.

Hey everyone.
I am trying to reskin the DTM Alco FA1, and all I'm getting is an error.
I am doing the logos for the PEN FA1, but when I try to load the modified images into RSBinTool, all i get is this:

What am I doing wrong? I am saving them as DXT3 like they should be, but this is occurring.
Wat do I do?
Noel.
I am trying to reskin the DTM Alco FA1, and all I'm getting is an error.
I am doing the logos for the PEN FA1, but when I try to load the modified images into RSBinTool, all i get is this:

What am I doing wrong? I am saving them as DXT3 like they should be, but this is occurring.
Wat do I do?
Noel.