Your Walkman cannot charge the battery.
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The USB cable is not connected to a USB connector on your computer properly.
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Disconnect the USB cable, and then reconnect it.
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Use the supplied USB cable.
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The battery is charged outside the temperature range of 5 °C to 35 °C.
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Charge the battery in a temperature range of 5 °C to 35 °C.
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The computer is not on.
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Turn on the computer.
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Your computer is in standby (sleep) or hibernation mode.
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Exit from standby (sleep) or hibernation mode.
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An AC adapter not compatible with your Walkman is being used.
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Use an AC adapter (not supplied) compatible with your Walkman.
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A USB hub is being used.
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Your Walkman may not charge via a USB hub. Connect the Walkman directly to the computer’s USB port.
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Your Walkman is connected to a computer running an operating system that is not supported.
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Check the system requirements of your computer, and charge with a computer running an operating system that is supported. [Details]
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You have not used your Walkman for more than a year.
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Depending on the conditions under which your Walkman is used, the battery may be deteriorated. Consult your nearest Sony dealer.
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If the problem still persists after performing the remedies above, press the RESET button to reset your Walkman. [Details]