Create a Map only shows title

Hi,

I have the following code for creating a map in Drupal 7 however only the title is showing, could someone point me to where I'm going wrong?

$map = array(
      '#chart_id' => 'visits_by_country',
      '#type' => CHART_TYPE_MAP,         //Map Type
      '#countries' => array('MG','KE','TN'),   //Array of ISO country codes (2 letter codes)
      '#georange' => 'africa',                    //Geographic Range of the Map - continent name or 'world'
      '#data' => array(10,50,100),        //Value affects intensity of colours which will be in the range defined by #data_colours second and third elements
      '#data_colors' => array('ffffff', 'edf0d4', '13390a'), //3 values for the colour (all other countries, start colour and end colour)
	  '#size' => array('#width' => 750, '#height' => 250),
	  '#title' => t('5616'), '#436C30', 15,
    );
$page_content .= theme('chart', array('chart' => $map));

Many thanks