Getting Blank Screen While Login in wp-login.php

Can anyone help me out as i am not able to login /wp-login.php while login i am getting blank page and when i checked wp-login.php file i found the enclosed lines in red ….can anyone please help me out on this as i dont know about coding…thanks in advance!!

</div>
<?php
/** This action is documented in wp-login.php */
do_action( ‘login_footer’ ); ?>
<?php if ( $customize_login ) : ?>
<script type=”text/javascript”>setTimeout( function(){ new wp.customize.Messenger({ url: ‘<?php echo wp_customize_url(); ?>’, channel: ‘login’ }).send(‘login’) }, 1000 );</script>
<?php endif; ?>
</body></html>