Dear Hafeezur rahman, I agree with the answer provided by Pankaj Gupta, If you dont get the login screen of your blogger.com or blogspot.com, then there will be some cookie problem.
It happens when you are trying to log on more than one blogger account on a pc, and also it happens when you again and again preview your blog.
It happens with us so many times.
By clearing your history, deleting cookies, will solve your problem.
Exit your explorer and clear your history and cookies by right clicking on the ie icon, and try with a new window.
Thanks & Regards
Siaar Ceo Siaar Group