Nishikant, "Charging is not supported with this accessories" is most ofter caused by a bad dock connector. Make sure that you are using an original cable, I have plenty of aftermarket and even 3G etc. cables that give me the same error. If you do have the right cable, make sure that your dock connector is clean, free of corrosion, and does not have bent pins. You can clean it with isopropyl alcohol and a few puffs of compressed air. Should that not work, I suggest to change the dock connector. Use this guide to replace it and you can get the connector from here, as well as many other places. Hope this helps, good luck.