Small bug fix in shader

You must have experience with Andengine framework. Mention "Andengine 2d" in the bid. I want a shader, that takes one single 2d texture and works on it. I am specifically looking for a water ripple shader. I already have the shader and andengine integration code ready but it is not working correctly. The actual job is to do a simple bug fix and make it work. Right now, the shaders do not throw up any error but the texture is not displayed.