Unable To Install Bootstrap

I have installed the bootstrap extension as mentioned in the installation instructions. http://www.cniska.net/yii-bootstrap/setup.html.
my directory structure is same as mentioned in the installation instruction and the content of my main.php is

<?php

// uncomment the following to define a path alias
// Yii::setPathOfAlias('local','path/to/local-folder');

// This is the main Web application configuration. Any writable
// CWebApplication properties can be configured here.
return array(
'basePath'=>dirname(__FILE__).DIRECTORY_SEPARATOR.'..',
'name'=>'My Web Application',

// preloading 'log' component
'preload'=>array('log'),'bootstrap',

// autoloading model and component classes
'import'=>array(
'application.models.*',
'application.components.*',
),

'modules'=>array(
// uncomment the following to enable the Gii tool
'gii'=>array(
'class'=>'system.gii.GiiModule',
'password'=>'admin',
// If removed, Gii defaults to localhost only. Edit carefully to taste.
'ipFilters'=>array('127.0.0.1','::1'),
'generatorPaths' => array('bootstrap.gii'),
),

),

// application components
'components'=>array(
'user'=>array(
// enable cookie-based authentication
'allowAutoLogin'=>true,
),
'bootstrap' => array(
'class' => 'ext.bootstrap.components.Bootstrap',
'responsiveCss' => true,
),
// uncomment the following to enable URLs in path-format
/*
'urlManager'=>array(
'urlFormat'=>'path',
'rules'=>array(
'<controller:\w+>/<id:\d+>'=>'<controller>/view',
'<controller:\w+>/<action:\w+>/<id:\d+>'=>'<controller>/<action>',
'<controller:\w+>/<action:\w+>'=>'<controller>/<action>',
),
),
*/
/*
'db'=>array(
'connectionString' => 'sqlite:'.dirname(__FILE__).'/../data/testdrive.db',
),
*/
// uncomment the following to use a MySQL database
'db'=>array(
'connectionString' => 'mysql:host=localhost;dbname=ricnet',
'emulatePrepare' => true,
'username' => 'root',
'password' => 'admin',
'charset' => 'utf8',
),
'errorHandler'=>array(
// use 'site/error' action to display errors
'errorAction'=>'site/error',
),
'log'=>array(
'class'=>'CLogRouter',
'routes'=>array(
array(
'class'=>'CFileLogRoute',
'levels'=>'error, warning',
),
// uncomment the following to show log messages on web pages
/*
array(
'class'=>'CWebLogRoute',
),
*/
),
),
),

// application-level parameters that can be accessed
// using Yii::app()->params['paramName']
'params'=>array(
// this is used in contact page
'adminEmail'=>'webmaster@example.com',
),
);


but I am still getting following exception while running the program.

Property "CWebApplication.0" is not defined.

Could you please tell me how to fix that. Thanks a lot