FB.getLoginStatus() called before calling FB.init(). How can I use Facebook API?

Question

I use this code to prepare the usage of the FaceBook API:

(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_GB/all.js#xfbml=1";
    fjs.parentNode.insertBefore(js, fjs);
} (document, 'script', 'facebook-jssdk'));

However, on document load I get the error of:

FB.getLoginStatus() called before calling FB.init().

I don't understand this message. I've googled for this problem and found some forum threads, but unfortunately they were not helpful at all. I have decided to post a question here about this problem, as I am unable to resolve it, because I'm noob about Facebook API. Sorry if my question is too simple to anyone and thanks in advance for any answer.

Answer 1

I have the same Facebook Log

 ***FB.getLoginStatus() called before calling FB.init().***

when document load. I find out that the #xfbml=1 in the end of

js.src = "//connect.facebook.net/en_GB/all.js#xfbml=1";

make this error. After deleting #xfbml=1, it's fine!