I have the iPhone 4 and I keep getting a "this accessory doesn't support charging" error message when I sync with my MBP.

It is also doing it with my car charger. Both of these have always worked fine in the past. Any ideas?
Thanks in advance for your help.

This means your iPhone has a major problem, and if the error message says connect to iTunes, you must do as provided and connect to iTunes. There isn't anything to figure out - you must connect your iPhone to iTunes as provided.

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