You need to update your texture pack to the same version as minecraft.
Every time Minecraft updates the game it will break almost every mod/texture pack so the mod writers have to update them to run right again. It can take hours or weeks depending on how large the mod or texture pack is to update them again.
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A mod (short for modification) is anything that changes the game play of Minecraft in any way. A mod is not to be confused with a texture pack, which merely changes the appearance of the game
Download the texture pack and put it into the Minecraft Texture Pack folder.
For Minecraft Oasis, the texture pack used by Cupcake is the FNI Realistic RPG texture pack. It can be found at Planet Minecraft.
you get a .zip of the texture pack, and copy it into the texture packs folder in the minecraft directory
First open the Minecraft texture template with a program that supports transparency. Either select the lava texture(found in the lower left corner of the template), and delete it; or paint over the texture with transparent color (The method you use depends on what program you are using). Finally, save the finished template as a file format that supports transparency, such as GIF or PNG.