[SOLVED] Missing **ALL** textures from inventory view

Hello minecrafters, I'm making a mod and actually everything works fine, except for one thing: All my mod elements have missing textures in inventory. Items are a total mess up, but the blocks if placed have the right texture. It's just the inventory ones are buggy. Please, help me with this problem as I can't find seem to be able to find a solution on my own, thanks in advance :).