Warning: require_once(Zend/Validate/Isbn.php): failed to open stream: No such file or directory in /var/www/static/library/ZendFramework-1.11.9/tests/Zend/Validate/IsbnTest.php on line 25

Fatal error: require_once(): Failed opening required 'Zend/Validate/Isbn.php' (include_path='.:/usr/share/php:/usr/share/pear') in /var/www/static/library/ZendFramework-1.11.9/tests/Zend/Validate/IsbnTest.php on line 25