Error parsing XML : The reference to entity “version” must end with the ';' delimiter [duplicate]

Answer 1

It looks like something is interpreting your document as XML rather than HTML. XML is much stricter than HTML - one of the rules is that ampersands (&) have a special meaning. They mean "here comes an XML entity", which is a special character. For instance, you can type " to insert ", or > to insert > into your document.

In this case, your code is interpreting &version on line 6 as the start of one of these entities. If you update line 6 as follows:

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

Then you should find that error disappears.