Cocoa Beans bugged?

I'm playing Industrialcraft using the Tekkit modpack. Now, I've tried to plant Cocoa Beans, and it actually worked in one location. However, I couldn't plant them in any other location. There seems to be no difference between the locations. What is this?

Never mind, I fixed it. It seems the soil block itself, and also 2 or 3 blocks below it has to be dirt. It was sand for some reason.