Unable to start migration:
PLESK_ERROR: Unable get localhost file system: Unable to get local file system description: Unable to run 'getfs ''': getfs: execve failed for /usr/local/psa/admin/sbin/getfs: Permission denied
System error 13: Permission denied
Migration is performed from Plesk 12.x to Plesk 8.x.
Scenario of migration from newer versions of Plesk to older ones is not supported.