Itunes no longer syncing with my iphone

Hi
First post.
I'm using an iPhone 6, with latest IOS updates on it, and a iMAC, latest OS with all updates.
I have been using Itunes fine, until this morning.  I plugged my phone in to my MAC and added a new audiobook to my itunes library,  when I tried to sync the audiobook, I got the "This iphone is synced with another itunes library" message, I cancelled the operation, I tried changing a setting on the phone in itunes, e.g. set to sync manually.  when I click apply it tells me it will erase the phone if I continue.
This phone has not been associated with any other Itunes library, in fact it hasn't even been plugged in to any other computer. Can anybody help me shed some light on what has happened and how to re-enable synching from my MAC again.
Regards

What happens when you try to sync? Error messages?

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