While trying to migrate from Plesk to PPA after the command
ppa-transfer generate-migration-list config.ini
the following error is appeared:
Error while checking connection settings: 'Plesk error : Protocol version '220.127.116.11' is not supported. Current protocol version is '18.104.22.168''.
Current Plesk version is not supported.
Upgrade source Plesk to 8.6 or more.