Charger won't work with IPhone 3?

I have the cord but was missing the outlet adapter so I got one. I plugged in my IPhone and it said "Charging is not supported with this accessory". I looked at my mom's adapter (which works with my IPhone) and it's the same model and everything so what's wrong?

It says the same thing when you plug the ipad into the computer to. Maybe the outlet adapter you got is to small of a power source to actually charge it.

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