Messenger Extensions Javascript SDK Error 2071011

Question

I\'m trying to create a Messenger Web View (https://developers.facebook.com/docs/messenger-platform/messenger-extension) by using the Messenger Extensions Javascript SDK.

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Answer 1

I found "2071011" error explanation in messenger.Extensions.js minified source:

if (!p) {
    x(2071011, 'JavaScript bridge does not exist - Please make sure you are in latest ' + 'version of Facebook or Messenger App.');
    return;
}

p value equals q():

function q() {
    switch (o) {
        case h.ANDROID:
            return window._FBExtensions;
        case h.IOS:
            return window.webkit && window.webkit.messageHandlers;
    }
    return null;

}

Possible error causes:

1. Please ensure you have the newest Messenger App version (do not resolve problem in my case).
2. It is highly possible that Messenger Android app do not include variable window._FBExtensions into WebView context properly - I have this variable undefined and messenger.Extensions.js assumes that _FBExtensions variable already exists. I can't found currently workaround for this as it is Messenger App part.