Yii Code Generator Page Error

Hello Yii coders! I just shifted to Yii and currently following the screencast at Yii’s site. The first time I visit the code generator page, it works ok. localhost/yii/index.php?r=gii. I successfully created a controller. But Now when I try to login again to generate another controller, it redirects me to ‘My Web Application’ (Congratulations! You have successfully created your Yii application.). Will be waiting for a response and hope that this would be a nice forum! Thanks in advance.