Itunes won't sync certain playlists to my iphone. What can I do?

I just added new music to my itunes and after I sync'd my itunes to my iphone, it deleted my playlists "recently added" and "recently played' (but both of them are still on my itunes library. I've tried to change settings and it still won't sync.

Click your device in iTunes and click music scroll down the left side and there's a section entitled playlists. Make sure it is checked, or you can click at the top and tell iTunes to sync all music and playlists.

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