If you're consistently saving a double-digit percentage of your income for retirement, then congratulations. You've taken a huge step toward ensuring that you'll have a comfortable retirement. However, it's only the first step; the next is to grow your money so it will be enough to support you when you're no longer working. If you're making any of these common errors, then you may come up short despite your diligent saving. Please know that these are only generally examples of some common potential errors and these examples do not apply to everyone.