Charging is not supported by this device iPhone error? Is it fixable?

I have a pretty old Roxxy iPod dock (I got it around the time the first iPod Touch came out) and I just unearthed it from a box in my room that has been sitting there for gosh knows how long. Is there any way to get my iPhone 4s to charge from it so I can have a fully functional dock, or should I just invest in a new one?

The iPod dock was made for iPods, not the iPhone. The iPhone requires more power than an iPod, and the dock doesn't support that kind of power.