Fail open testdrive page

Hi, all. I created a testdrive webpage. But I want to open it. I had the following message:

Safari can’t open the page “http://localhost:8888/testdrive/” because the server unexpectedly dropped the connection. This sometimes occurs when the server is busy. Wait for a few minutes, and then try again.

Yii is in Mac OS X 10.4

I checked php_error.log but it doesn’t have any kind of info related with it.

Any ideas?