WordPress Error: Is its parent directory writable by the server?

When I want to upload a file to my Wordpress blog, there was an error shown on the Media page like in the image above. "facebook.png" has failed to upload due to an error Unable to create directory /home/OLDPATH/public_html/BLOG/wp-content/uploads/2011/03. Is its parent directory writable by the server? Supposedly there should be no problems because I have successfully Continue reading "WordPress Error: Is its parent directory writable by the server?"...