ITunes Won't Sync Photo's into iPhone?

Hi! So I have a Canon camera and I love putting my photos on my iPhone(5), so it's been working fine so far, but for the last day its not been working.There's plenty of GB space for the photos. I press sync but then it stops at "Waiting for items to copy" and it's just there loading, forever until I cancel it. My phone also doesn't have the little sign that tells u it's syncing. My iTunes is also up to date. So what's going on?

The changing the folder which contains your pictures to another and try to sync again. I had this problem when is was on iOS 6.1.3 and this seemed to work