Not enough space error message on iTunes when trying to sync with iphone
I recently bought a new macbook air and wanted to get my iTunes library onto it. I discovered that I could homeshare with my previous windows laptop and managed to successfully transfer the library into iTunes on my mac (without the playlists). When I tried to sync my iPhone with the iTunes on my mac it came up with a message which said that it couldn't sync because there wasn't enough room on my iPhone (needed about 2 extra GB). I don't see how this can be correct since the library should be the same as that currently on my iPhone.
not I've been told that this sync should delete what is currently on my iPhone and replace it with the library in the iTunes on my mac, but I think that it must not be doing this and this is the reason for the need for extra space. I have noticed that the playlists on my iPhone have been deleted but yet when I added a new one on iTunes and synced it, the same error message occurred. I have tried several solutions such as unchecking sync all music, applying it and checking it again. And I am only trying to sync my music library which is only 14GB so there should be no problem. I really don't want to have to restore my iPhone completely but would be happy to delete the music on my iPhone and replace it with the library in iTunes on my mac. Any help would be gratefully received
MacBook Air, iOS 7.1.2