Strange error message (-1009). Please help?

So basically i plugged my iPod Shuffle (latest gen.), synced some music, and left it in the computer while connected to iTunes and closed my MacBook. When i came back after an hour and opened up my Mac agin, a error message appeared on the screen. It said something about -1009, but i just clicked ok. What could it have meant?

Have a nice day/

 

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