Unable to create directory /home/jamshidh/public_html/wp-content. Is its parent directory writable by the server?

I recently had a problem regarding this issue in my blog (WordPress 3.3). The problem occured when I wanted to upload an image to one of posts. When trying to upload the image, the following error occured: Unable to create directory /home/jamshidh/public_html/wp-content. Is its parent directory writable by the server? After some searchs regarding this …