Unable to perform migration: Unable to find archive metadata. The archive is not valid Plesk backup or has been created in an unsupported Plesk version

Symptoms

• Migration performed from Plesk 18.0.27 or lower to 18.0.27 version failed with the following error:

  PLESK_ERROR: Failed to import backup dumps to target panel’s repository
  Cause: Failed to import backup XML: errcode must be ‘0’ (no errors) or ‘116’ (backup sign error).
  Output of pmmcli utility:
  <?xml version=“1.0” encoding=“UTF-8″?>
  <response>
  <errcode>119</errcode>
  <errmsg>Unable to import file as dump: Import error: Unable to find archive metadata. The archive is not valid Plesk backup or has been created in an unsupported Plesk version</errmsg>
  </response>
  That is a critical error, migration was stopped.

• Additional Apache/nginx directives are not migrated with the following error:

  PLESK_ERROR: Failed to transfer additional Apache/nginx directives
  Migration tools tried to perform operation in 3 attempts: Command LANG=en_US.UTF-8 ALLOW_WEAK_PASSWORDS=1 PLESK_RESTORE_MODE=1 backup_restore_helper –restore-subscription example.com -ignore-nonexistent-options failed with exit code 1:
  stdout:
  stderr: Unknown command: –restore-subscription

  Note: The above error is shown after updating to the new Plesk Migrator version v2.19.4

Cause

Bug #PMT-4781 has been fixed and migration is now possible.

Resolution

To fix migration error, update Plesk Migrator extension:

1. Log into Plesk.

2. Go to Extensions > Updates > Check Now and update Plesk Migrator to version v2.19.4 :
   

   Note: If no updates are shown that means that Plesk Migrator has already been updated. The version can be checked in Extensions > Plesk Migrator