All of my contacts are gone

I have been using this app and The Knot app since my wedding in 2014 for the guestbook. I saved all my contacts addresses in this app. Today I went in to change a friends address that had moved and all of my contacts are gone and the format has completely changed. Im furious. Make sure to save your guests addresses somewhere else!

Spenser989 about Wedding Guestbook by The Knot, v2.2.0