Iphone 5c won't charge on wall charger but will on usb computer port?

My iphone5c gets a message when plugged in to wall charger saying "this device may not be supported" and it won't charge yet if I use my pc usb port it says nothing and charges right up every time and I can't understand why my wall charger makes it say that and won't charge it?

Are using the cable that came with your iPhone? Sometimes, aftermarket cables/chargers won't be supported by Apple devices.

If you are using the charger that came with your iPhone, then maybe something is wrong with the outlet you are using? Try plugging the charger into another outlet. See if that solves your problem.

Hope this helps!