ITunes displays an error - The iPhone 'User's iPhone' cannot not be synced. An unknown error has occured

The error number is (-69)
I have tried deleting all music files in my itunes library with an exclamation mark next to them, but this error still occurs. I have also updated to the most version of iTunes and had to restore my iphone after the latest software update as it would not sync any songs or apps from my library!
HELP!!

Error 1 or -1
This may indicate a hardware issue with your device.
Follow Troubleshooting security software issues, and restore your device on a different known-good computer.
If the errors persist on another computer, the device may need service.

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