Error:  Data structure returned is not convertible in the requested format. Try to call this method with the parameters '&amp;format=original&amp;serialize=1'; you will get the original php data structure serialized. The data structure looks like this: 
 $data = array (
  0 =&gt; 
  array (
    'name' =&gt; 'Dashboard',
    'widgets' =&gt; 
    array (
      0 =&gt; 
      array (
        'module' =&gt; 'VisitsSummary',
        'action' =&gt; 'getEvolutionGraph',
      ),
      1 =&gt; 
      array (
        'module' =&gt; 'Live',
        'action' =&gt; 'widget',
      ),
      2 =&gt; 
      array (
        'module' =&gt; 'VisitorInterest',
        'action' =&gt; 'getNumberOfVisitsPerVisitDuration',
      ),
      3 =&gt; 
      array (
        'module' =&gt; 'PiwikPro',
        'action' =&gt; 'promoPiwikPro',
      ),
      4 =&gt; 
      array (
        'module' =&gt; 'CoreHome',
        'action' =&gt; 'getPromoVideo',
      ),
      5 =&gt; 
      array (
        'module' =&gt; 'Referrers',
        'action' =&gt; 'getWebsites',
      ),
      6 =&gt; 
      array (
        'module' =&gt; 'VisitTime',
        'action' =&gt; 'getVisitInformationPerServerTime',
      ),
      7 =&gt; 
      array (
        'module' =&gt; 'UserCountryMap',
        'action' =&gt; 'visitorMap',
      ),
      8 =&gt; 
      array (
        'module' =&gt; 'DevicesDetection',
        'action' =&gt; 'getBrowsers',
      ),
      9 =&gt; 
      array (
        'module' =&gt; 'Referrers',
        'action' =&gt; 'getSearchEngines',
      ),
      10 =&gt; 
      array (
        'module' =&gt; 'ExampleRssWidget',
        'action' =&gt; 'rssPiwik',
      ),
    ),
  ),
);