I change "message.php" and plesk crash. How do i come back

[hardbrasil]

I overwrite an archive messages.php from
/usr/local/psa/admin/plib

and an error appears.

i had made an backup before this change but when i come the original file the plesk doesnt come to normal, only left menu appears and all links are bronken.

The content of file message.php:

<?php
die("The file messages.php is part of Plesk distribution. It cannot be run outside of Plesk environment.\n");
__plesk_loader_pragma__('B');
?>