Why does iTunes not sync a ringtone to my iPhone 4s?

So i have a Ringtone that ai want to sync to my iPhone and when i do it says, "Skrillex - WEEKENDS! (feat. Sirah)" was not copied to the iPhone "--- iPhone" because it could not be found. But when i go to tones and listen to it, it doesn't say the message that the song could not be found.

I have a 4s also & same problem. My phone has the update. Did you do the update because i think thats why we have this problem

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