jsnetworkx.js:5 Uncaught TypeError: Cannot read property 'force' of undefined

Hi, I'm trying to draw the graph, but always get this error:
jsnetworkx.js:5 Uncaught TypeError: Cannot read property 'force' of undefined

Even if I try sth. like this:
` G = new jsnx.Graph();

```
G.addNode(1);
G.addNode(2);

G.addEdge(1,2);

jsnx.draw(G, {
element: '#canvas',
withLabels: false
});`
```

Does someone have an idea what's the reason for this?

D3 is included.

Thanks in advance.