Warning: require_once(Zend/Loader.php) [function.require-once]: failed to open stream: No such file or directory in /usr/www/users/learng/application/bootstrap.php on line 19

Fatal error: require_once() [function.require]: Failed opening required 'Zend/Loader.php' (include_path='.:/usr/local/lib/php/:application/library:/usr/home/rcmscl/Zend_Framework/1.7.5:application/models:application/plugins') in /usr/www/users/learng/application/bootstrap.php on line 19