Wow this is a total mystery! So it's happening on Android and Apple devices but now also on computers too. I will forward this message to the Community Manager to see if she can check it out with the studio.
There are only a few chocolates on this board to begin with so you need to let the chocolate grow until you have enough for the orders. I think the level only begins with 8 pieces and you need to collect 15.
If you clear the chocolate too quickly, it will not be able to grow and you will not then be able to collect the chocolate required for this level and you will then see this error message.
I did realize finally that I needed to keep the mixer available. I also noticed that there was a message about the mixer at the start but it only flashed on; there was no time to actually read it. The error message itself isn't helpful at all and it should be updated to indicate why you failed the level.