Tesseract.js error

Hi everybody.
I'm working a mobile app with Cordova (always the same :)). Now i have to implement some OCR function and I found tesseract.js script.

As often it happens, at least to me, reading docs everything looks to be easy but I've just included tesseract.js in my test app (built just to exepriment this plugin) and I get this error:

Uncaught TypeError: Object function Object() { [native code] } has no method 'assign' 

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This is my directory tree:

root
-- css
-- img
-- js
  -- index.js
  -- jquery-2.1.4.min.js
  -- tesseract.js
  -- worker.js

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This s the related head section of my index.html:

        <script type="text/javascript" src="js/jquery-2.1.4.min.js"></script>
        <script type="text/javascript" src="js/worker.js"></script>
        <script type="text/javascript" src="js/tesseract.js"></script>
        <script type="text/javascript" src="cordova.js"></script>
        <script type="text/javascript" src="js/index.js"></script>		
        <title>Hello OCR</title>

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I see many other get it work and I'm wondering what I'm doing wrong....
As usual, any help will be deeply appreciated.

Cheers