Unable to start migration:
PLESK_ERROR: Error: Unable to start the migration: the user name or password is incorrect. Make sure that the built-in administrator account login and password for the target host are correct and try again, or refer to the Plesk error log for details.
Internal error ;-P ERROR: Plesk\Lock\Exception: Lock Manager error: 'System error 0xC0000005 occured.'. (Hierarchical.php:126)<br />
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The migration process was running not as build-administrator account for target or source server.
In Plesk navigate to Extensions > Migrator > Start a New Migration.
Input the correct credentials for the built-in administrator account for source and target servers.