Purchasing Minecraft error

I tried to purchase Minecraft from the website, but to my luck, it did not work. At first, it said something about I typed something wrong, I checked and everything was fine. I clicked submit again, another error occurred about a transaction error! Please, anyone? I cant save an image of the error due to my card now having insufficient funds, so the error would not appear. I know this has nothing to do with "Minecraft" but it technically does.