Full server migration fails with message:
Unable to find the Web Presence Builder restoration utility to restore Web Presence Builder data. Web Presence Builder is probably not installed. It will be unavailable for the following objects: Server settings
Web Presence Builder is not installed on destination server.
According to Plesk 12.5 release notes Web Presence Builder has become an optional component of Plesk.
You can install it from Plesk > Tools & Settings > Updates & Upgrades > Add/Remove Components
After that start migration again.