Problems of sync

Hi, I got Omnifocus version 1.10.4, and I updated it to 1.10.6 (MacOS 10.6.8), and I have this 1.15.1 version on my iphone 4S.

Impossible to sync with wifi. App has been desinstalled and reinstalled on the iphone, and the first thing I try to do is to choose “Mac via wifi” on sync setup, but there is no mac in the list.

Wifi is ok, on the same network, on both mac and iphone. I chose to sync my omnifocus version on mac with nothing, and I want to sync my iphone with the mac. Not so difficult normally, no ?

What can I do ? Thx for your help