Photos will not sync on iPhone 4S?

I recently tried to add some photos onto my iPhone 4S. My phone is already synched with my Macbook Pro, and my entire photo library was already on my phone. But after I synched the phone, an alert came up on my phone saying "800 items could not be synched. View iTunes for further details." The next time I tried, the number went up to 1, 200, and the next time it was up to 1, 800. Each time I tried syncing my phone, I lost more and more photos.

Does anyone know how to solve this? I want to sync my entire library (about 2, 400 pictures).It isn't a storage problem, as I should have another 2 gigabytes left over, and it isn't a formatting problem - all my images are shot in RAW and JPEG. I tried deleting the iPod Photo Cache, but that did not work either. I also updated and restarted my computer, iTunes, and my phone. Any solutions would be greatly appreciated, thank you!

My phone is running on IOS 6.1.3, and my iTunes is 11.04, and my Mac is running on OSX Snow Leopard.

Reboot it