Hello Parth Lawate,
I'm really sorry that delayed of this reply,
After debugging long time ago, it seems like you comment out this line
JoomlaFolder\template\Bootstruct\html\com_easyblog\blog.comment.form.php
<?php // if($config->get('main_subscription') && $blog->subscription) : ?>
<div id="subscription-message" class="subscription-message">
<div class="clearfix mtm mbm">
<input class="inputbox easyblog-checkbox" type="checkbox" name="subscribe-to-blog" id="subscribe-to-blog" value="yes" <?php echo $system->config->get( 'comment_autosubscribe' ) ? ' checked="checked"' :'';?> />
<label for="subscribe-to-blog"><?php echo JText::_('COM_EASYBLOG_SUBSCRIBE_BLOG'); ?>
<?php if( $my->id > 0 ) : ?>
(<?php echo $my->email; ?>)
<?php else: ?>
(<?php echo JText::_('COM_EASYBLOG_ENTRY_AUTO_SUBSCRIBE_NOTE'); ?>)
<?php endif; ?>
</label>
</div>
</div>
<?php // endif; ?>
And disable the option from your backend > EasyBlog > Setting > workflow > subscription > Allow entry subscriptions - NO,
I have help you temporary to enable this setting and uncomment above code line, it work fine now. Please have a check.