Error parsing XML, line The reference to entity "version" must end with the ';' delimiter.

<div id="fb-root"></div>
<script>(function(d, s, id) {
  var js, fjs = d.getElementsByTagName(s)[0];
  if (d.getElementById(id)) return;
  js = d.createElement(s); js.id = id;
  js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.0";
  fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>

It looks like something is interpreting your document as XML rather than HTML. XML is much  stricter than HTML .This error occures when a facebook page plugin  code is added to the blogger template code.To avoid this ,replace the 6th line .

 js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.0";

with the line given below

js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.0";