Chart add-on: No Data / Not Visible

Hi,
 i'm facing a problem I cannot solve by myself. I'm using Vaadin 7.5.8 with DCharts 1.7.0

 I've created a simple app to try DChart. But currently, i'm not able to show anything on my browser.
 The simple project is to draw a Gauge.
 Here is my code (mostly grabbed from the example)

DataSeries ds = new DataSeries();
ds.add( 53 );

SeriesDefaults sDef = new SeriesDefaults().setRenderer(SeriesRenderers.METER_GAUGE);
Options options = new Options();
options.setSeriesDefaults(sDef);

DCharts dcharts = new DCharts( ds, options );
dcharts.show();

myVerticalLayout.addComponent( dcharts );

When I'm looking on my browser safari console, I can see:

No Datainitjqplot(fonction anonyme)myApp:13:223applycmyApp:2:7978fireWithmyApp:2:8775readymyApp:2:3393

This is followed by:
[Error] Failed to load resource: the server responded with a status of 404 (Not Found) (jquery.min.map, line 0)

I'm currently stuck. I've been seeking inside the generated HTML Tag, and nothing is created about the DCharts.
I'm sur i'm doing something wrong, but I cannot see it.

If anyone can help me,

Best Regards,
Frédéric