The render result is just the transparent texture? I rendered a 1200x800 image, but it's just the transparent texture thing:



I used Cycles for this image. In a test in Blender Render, it worked perfectly, although the materials were made in Cycles so you obviously couldn't see them as you were supposed to.
you need to create a cycles material for visible your render because cycles engine needs nodes tree for render  you can't render blender internal  material into cycles render