I have a feeling this is an old recipe, I'm not certain, but if you have NEI installed, you should be able to look up the recipe of the current version.
Else, have you actually tried taking the results of the recipe?
Things turn up like that for me all the time, because I have greg-tech installed with unleashed, but the server doesn't. So my client tells me that the regular bucket recipe is invalid (No output), yet I can still take the bucket out of the recipe.
I have looked up the recipe in NEI, that's what it showed. I have tried clicking on the empty space aswell, nothing. I need to make an ME system. ;_;