Cannot export a database through PHPmyAdmin, and the plesk panel log '/usr/local/psa/admin/logs/panel.log' shows the following error:
PHP Fatal error: Cannot call overloaded function for non-object in /opt/psa/admin/htdocs/domains/databases/phpMyAdmin/export.php on line 409
This error is due to incorrect PHP APC module configuration
In apc module configuration file increase 'apc.shm_size' to 256M and 'apc.max_file_size' to 5M. Else change the value to required value.
Open the php.ini file and modify the following line:
apc.shm_size = 256M
apc.max_file_size = 5M
and restart sw-engine with command: '/etc/init.d/sw-engine restart'