Minecraft says that my skin is corrupted

When i was playing Minecraft Beta 1.2.0.7, i noticed that my skin in the home screen was entirely black, i thought that it was just that the game could not show the skin in the home menu, but when i tried to load a world, an error poped up saying that the world could not load because there was an error with my skin, or that it was corrupted; i know that my skin is not corrupted because it was working in the last beta.