Plesk restore error;

Trying to restore Plesk settings from backup gives:
Error:
Execution of dd if=/dev/zero of=/usr/local/psa/PMM/rsessions/20161010213516347/.fs_sKgOGw/.reserved bs=10485760 count=1 failed with return code 1. Stderr is dd: failed to open '/usr/local/psa/PMM/rsessions/20161010213516347/.fs_sKgOGw/.reserved': Permission denied

Anyone knows how to fix this?

Br,
Denis