You are not assigning the dashboard to any variable. You code reads:

new google.visualization.Dashboard(document.getElementById('dashboard')). 
  bind([agePicker, genderPicker],barChart). 
  draw(data); 

google.visualization.events.addListener(dashboard, 'ready',  function() 
{...});

But the 'dashboard' object is undefined.
The declaration line should read:

*var dashboard* = new google.visualization.Dashboard(...);
dashboard.bind(...);
dashboard.draw(...);

google.visualization.events.addListener(dashboard, 'ready',  function() 
{...});

/R.

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