Fatal error: Class 'JLanguageMultilang'

There is a problem. Set normal component of (2.3), but when you start writing :blink:
Fatal error: Class 'JLanguageMultilang' not found in Z:\home\sitara\www\administrator\components\com_osproperty\osproperty.php on line 64.
2.0.7 works, but 2.3 does not run .
PHP Built On Windows NT TOSHIBA 6.2 build 9200 (Unknow Windows version Home Premium Edition) i586
Database Version 5.5.25
Database Collation utf8_general_ci
PHP Version 5.3.13
Web Server Apache/2.2.22 (Win32) mod_ssl/2.2.22 OpenSSL/1.0.1c PHP/5.3.13
WebServer to PHP Interface apache2handler
Joomla! Version Joomla! 2.5.0 Stable [ Ember ] 24-Jan-2012 14:00 GMT
Joomla! Platform Version Joomla Platform 11.4.0 Stable [ Brian Kernighan ] 03-Jan-2012 00:00 GMT

Hi,
You are using Joomla 2.5.0, please upgrade it to latest version 2.5.14, the problem will be solved.
Thanks
Dam

updated. Everything is OK. thank you very much