[Blogger] Error parsing XML ：The reference to entity “version“ must end with the 〝；〝 delimiter

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.

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Source

☞ Error parsing XML : The reference to entity “version” must end with the ';' delimiter
☞ Error parsing XHTML: The content of elements must consist of well-formed character data or markup