Syncing iPhone with Accordance

Ever since I deleted the Accordance alpha from my iPhone and reinstalled the Accordance app, Accordance will not sync. When I select “Sync all content with Accordance” and try to sync, the Accordance app on my Mac displays a message: “The mobile device ”iPhone" has never been synced with this computer." When I select OK, it displays a list of items to sync, but when I select ‘Sync Now,’ it downloads the first selection and then stalls.