Thanks for anybody who come in. I new with octpress, Actually, I have just installed octpress yesterday.
However, after all installing procedure was carried out, I execute the "rake preview" command.
The server seems worked well.But when I attempt to visit the website "localhost:4000" ,only a blank page can be seen.
and the server returns a "404" code.
I don't understand why it happends like this.
Octpress3.0 was used.
Thanks for all kinds of inforamtion.