Hey Ratnakar Reddy,
Thanks for the question. I understand that you are experiencing issues syncing your iPhone with iTunes. The following resource outlines the exact error message you are receiving:
I have an iPhone6 and this week it stopped downloading any more songs to it. The songs have played on this iPhone before, but after removing them, I cannot add it back. I cannot add back the audiobooks I was listening to at the beginning of the week. I have tried loading an older backup restore (2 years old, way before this issue) no luck though.
When adding songs, error is in iTunes:
"Some of the item in the iTunes library, including "...", were not copied to the iPhone "" because they cannot be played on this iPhone.
Next remove the Sync Music check.
When adding audiobooks, the error is on the phone:
"!iTunes Sync 164 items could not be synced. See iTunes for more information" but there is no information.
Do I have to start from Restore iPhone?