Why does my iPhone display error message?

My iPhone 3GS displays an error message, "charging is not supported with this accessory." My phone still charges however it constantly displays this message. How do I resolve this issue?

Added (1). This message started to appear after I plugged it into my friend's stereo (1/8") jack but I'm using my original charger now.

Added (2). This message started to appear after I plugged it into my friend's stereo (1/8") jack but I'm using my original charger now.

Are you using the original charger? This message usually appears when your charger isn't original.

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