After upgrade from 7.0.1 to 7.0.3 ( plesk windows service pack 2 ) . i get this note in event viewer . What is it ? ) The description for Event ID ( 2000 ) in Source ( c-client ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: c-client, PHP Fatal error: Call to undefined function: get_os() in C:\Program Files\SWsoft\Plesk\admin\plib\constants.php3 on line 130.