Why Cakephp told me "I don't / can't use URL rewriting" when i've visited the website at /posts/index or /posts/view

hello,buddies.

i can visited the website in my computer using locahost with /posts/
index or /posts/view(is apache running the module of rewrite
successful ?the controllers and models are ok.),but cakephp show me
the errors:

URL rewriting is not properly configured on your server.
Help me configure it
I don't / can't use URL rewriting

when i using the default layout default.ctp.

the rewrite module of apache is built-in,I've not write "LoadModule ..
"in httpd.conf,the version of apache is 2.2.19
the version of php is 5.3.6.
the OS is linux mint.

ps: my english is so poor,i'm learning it hardly,please point any
syntax error to me,many thanks for everyone.

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