Why won't my Ativa flash drive work in this Mac?

I am using a school Mac and when I plug my Ativa flash drive in, a message pops up that says,"USB Low Power Notice, The USB device cannot operate because it needs more power than is available. To correct this problem you can: 1) Plug the device into an electrical outlet if it has a power cord. 2) Unplug the device and plug it into another USB port on your computer or other device that is plugged into a power cord." I tried plugging it into the other USB port but the same message popped up. I didn't think flash drive could lose power. What do I do?
 
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