Error Created Yii Application

Hello, someone have found this trouble, when I try to create my application I only get the caracter y on my screen, I need to press ctrl+c to break it and I take a look on my error_log file and read that "PHP Notice: Undefined index: SCRIPT_FILENAME in YiiRoot/framework/base/CApplication.php on line 142"

I just change my .htaccess and that’s all

What was the change about?