Hi,
I suggest you to backup all the songs in the Walkman Player to the Computer and Format the Player.
Connect the Player to the Computer to charge it until FULL message is displayed.
Reset the Walkman Player. To reset it by pressing the RESET button with a small pin or similar object. You can also Format the Player if the Format option is available by accessing the Home Menu.
To Format the Player; press and hold the BACK/HOME button, select Settings-->Common Settings-->Format-->YES.
WARNING: There is a risk of data loss. If the memory is formatted, all files including the Operation Guide (If applicable to your model) stored in the player will be deleted. Be sure to verify the files stored in memory prior to formatting and export necessary files to the hard disk of your computer or other device.
Once the Format completes, reset the Player by pressing the Reset button located at the bottom of the Player using a sharp pointed object. Now you can transfer the required songs and files to the Player using the supplied Software or by dragging and dropping the songs through Windows Explorer. This will resolve the issue.
Good Luck!
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