Magento - checkout 404 not found error

I have followed this tutorial : http://www.igorkrasnykh.com/2010/04/14/bypass-magento-payment-and-shipping-1-4/comment-page-1/#comment-319

to bypass the Payment and Shipping Methods im Magento, but this create a 404 error when click on Checkout link (in the toplinks).

How can correct this error ??

Please hel开发者_StackOverflow中文版p !

Always flush the caches after install new extension or sources, this will kill lots of 404 problems.

Then post logs here will be helpful to understand your problem. thanks.