cake php action not working

[aqeel]

i have just started working with cake php i have 3 pages
posts.php (model)
posts_controller.php (action's name is hello)
hello.ctp

but when i write the url
http://localhost/cakephp_blog/posts/hello

its gives me the error that url not found

in hello.ctp i have just write <h2>Some text</h2>

can anyone help me why i am getting this error i have also tried some changes in httpd.conf

[JShor]

This isn't a PHP problem, this is a configuration issue. Try adding a RewriteRule in .htaccess to redirect http://localhost/cakephp_blog/posts/hello to wherever hello.ctp is located at.