External libray permission refused

Hello,

I would like to add an external library ( from http://visjs.org/index.html#download_install ) so i followed the tutorial : create new external folder, add the js file inside and update the tsconfig.json.

In visual.ts I declare a global variable, because there is no d.ts file in the library, with this line :
declare var vis: any;

Then I want to call a function :

var items = new vis.DataSet([
                { id: 1, content: 'item 1', start: '2014-04-20' },
                { id: 2, content: 'item 2', start: '2014-04-14' },
                { id: 3, content: 'item 3', start: '2014-04-18' },
                { id: 5, content: 'item 5', start: '2014-04-25' }
            ]);

But if I go to the internet explorer's console i can see an error :

Permission denied

So what's wrong ?

I also tried with another library which has a d.ts but even with the declaration file i have the same error.

Thanks