Clear Page Cache does not work.

[eluser]murphy2006[/eluser]
Hello,

I am using native CI page cache for my blog. The caching of the page works fine but I want to be able to delete cache file for the page I have edited.

I found a nice function for this here: http://codeigniter.com/wiki/Clear_Page_Cache/
But sadly I cannot get it to work with the below code:

Code:

$this->output->clear_page_cache('post/1');

The URL to the page I want to delete cache for is:

Code:

http://localhost/blog/post/1/

What is missing here, why can´t I get the function to remove the file?
Is there any other ways to clear the PAGE cache?

Thankful for all help!

Kind Regards,
Daniel