Open Flash Chart IO ERROR #2032

I’m using piwik 0.4.1 and I’m getting the following error message when I try to view the last visits graph for the week or for the year :

[b]Open Flash Chart
Loading test data
Error #2032

This is the URL that I tried to open:index.php?module=VisitsSummary&action=getEvolutionGraph&columns[]=nb_visits&idSite=1&period=year&date=1999-01-01,2009-12-31&viewDataTable=generateDataChartEvolution[/b]

Has anybody an idea of the problem cause ? Thanks in advance.

Wait for 0.4.3. A number of JSON parsing issues have been fixed since 0.4.1.