My iTunes won't let me add an album to my iPhone?

I don't have this problem with any other music I try to add, but I accidentally deleted an album off of my phone and when I try to re-add it, it will not no matter what. I've tried adding it to a playlist, I've tried adding it different ways many times. Why is it doing this with only this album?

Well if it's still on iTunes, then just sync the phone and it should re-appear.

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