Itunes can't find my Iphone and sync over wifi

First with your iPhone connected to the computer with cable, select your iPhone in iTunes on the left side bar.

Then, on the Summary tab in iTunes, scroll down and check the box that says, "Sync with this iPhone Over Wifi."

Finally, someone with same issue I'm experiencing.

Only, it's Ipod Touch+MBP133

Actually, I did manage to sync it several times while not modifying library's contents. As soon as I added/removed an album, sync failed.

Could be outdated MacBook Pro, since AirDrop isn't supported with it too.