I almost jumped into that one. Read the description here in the forum. Coasted right over the last step, not paying attention to the expansion size. Luckily I didn't have enough RC to start it and had to wait a few days. It was then that I read some complaints and realized I couldn't do it either!
As was mentioned earlier, do check all the steps, and check them carefully! I started Little Blue Farming Hood classic mission last week after reading over the steps and making sure I had all the machines. Turns out, one of the items I needed to make was chocolate milkshakes. I had the milkshake machine. But in order to make chocolate milkshakes, you also need the pudding machine, which I don't have. Thank goodness Little Blue Farming Hood is one that gives a good deal of time to finish -- enough time for me to build up RC for the pudding machine and complete the mission.
So I have learned to not only make sure I have the machines specifically referenced in the mission steps, but also the machines needed to make the ingredients as well.