See the details at “Algorand wallet 3.1.0 lost all contacts”, https://forum.algorand.co/t/algorand-wallet-3-1-0-lost-all-contacts
Algorand wallet 4.0.0 lost all contacts - the same error again?
See the details at “Algorand wallet 3.1.0 lost all contacts”, https://forum.algorand.co/t/algorand-wallet-3-1-0-lost-all-contacts