So atlast error was fixed by the hosting company 😎
The reason of error on my Blog was due to upgradation of PHP version by the host company to 4.3.10, which is not compatible with WordPress, except if some adjustments are made.
The error appearing on the Blog was… as shown in the following link: http://wordpress.org/support/3/19007
The PHP’s newest version was launched on 15 December, 2004.
So as the Hosting companies update the PHP version, more blogs may get affected.
Also read this:
In case, any one sees such an error, please contact Hosting Company, there is nothing wrong with your code or blogs.