Ringtone won't sync onto iPhone?

I made a ringtone, got it onto my iTunes and it plays perfectly. It shows up on the "Tones" tab but when I check it to be sync'd, it will check it but won't register.SO, if I have all 3 ringtones checked, minus the one I made checked, at the top it says "Sync 3 tunes" since there's three checked, but when I check the last one, it'll check it but still say "3 tunes" at the top. When I syn it won't show up in my ringtones on my phone. What do I do?

Just unplug your iphone from the charger then plug back into the computer

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