Finally, I was able to upgrade my blog to new blog format.
I was trying to upgrade my blog since the blogger beta was out and everybody can move their old blog to the new blog format.
Although, I could see the 'switchnow' buton on the blogger's main page, couldn't succeeded for couple of weeks just because whenever tried to switch, I was constantly getting, 'sorry message'. At last, after many unsuccessful attempts, today, I have seen 'Your blog is ready to switch' message on the Bloggers start page and immediaely I have switched the old blog to new blog.
It only took 5 minuts to switch.
Well, its time to play around with the new blog features.