Problems with adding a mysql Database

[Detonatorxyz]

well when i want to add a mysql database over Plesk

i updated this file here before
http://kb.swsoft.com/article_0_1630_en.html

i get the following message

Fatal error: Class DatabaseManagerMySQL contains 5 abstract methods and must therefore be declared abstract or implement the remaining methods (DatabaseManager::disableUserImpl, DatabaseManager::getDatabaseSizeImpl, DatabaseManager::dropLocalAdminLoginImpl, ...) in D:\Program Files\SWsoft\Plesk8\admin\plib\DatabaseManagerMySQL.php on line 11

Server OS is Win 2k3 Webedition