Warning: require_once(/lib/Facebook/HttpClients/FacebookCurlHttpClient.php): failed to open stream: Input/output error in /facebook_init.php on line 24

Fatal error: require_once(): Failed opening required 'lib/Facebook/HttpClients/FacebookCurlHttpClient.php' (include_path='.:/usr/local/lib/php') in /facebook_init.php on line 24