.htaccess - Yii url rewriting removing index.php

I am trying to make the url rewriting and i want to remove index.php and I have done some research and found the online documentation aswell.

Here is what i did so far i uncomnted my main.php urlmaneger and i have the following

'urlManager'=>array(
            'urlFormat'=>'path',
            'showScripName'=>false,
            'rules'=>array(
                '<controller:\w+>/<id:\d+>'=>'<controller>/view',
                '<controller:\w+>/<action:\w+>/<id:\d+>'=>'<controller>/<action>',
                '<controller:\w+>/<action:\w+>'=>'<controller>/<action>',
            ),
        ),
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and i have .htaccess which is loacted in my yiiApplication

RewriteEngine on

# if a directory or a file exists, use it directly
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

# otherwise forward it to index.php
RewriteRule . index.php
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Now when I launch the application it gives me the following error.

**Property "CUrlManager.showScripName" is not defined.**
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How do I fix this?I do have my Rewrite engine on and also i have no errors on my php log or wamp server log.

Should I rewrite all of my urls inside of my project?