Error:  Data structure returned is not convertible in the requested format. Try to call this method with the parameters '&format=original&serialize=1'; you will get the original php data structure serialized. The data structure looks like this: 
 $data = array (
  0 => 
  array (
    'uniqueId' => 'General_Actions',
    'name' => 'Behaviour',
    'subcategories' => 
    array (
      0 => 
      array (
        'uniqueId' => 'VisitorInterest_Engagement',
        'name' => 'Engagement',
      ),
      1 => 
      array (
        'uniqueId' => 'Transitions_Transitions',
        'name' => 'Transitions',
      ),
      2 => 
      array (
        'uniqueId' => 'General_Downloads',
        'name' => 'Downloads',
      ),
      3 => 
      array (
        'uniqueId' => 'Actions_SubmenuPagesEntry',
        'name' => 'Entry pages',
      ),
      4 => 
      array (
        'uniqueId' => 'Actions_SubmenuPagesExit',
        'name' => 'Exit pages',
      ),
      5 => 
      array (
        'uniqueId' => 'General_Outlinks',
        'name' => 'Outlinks',
      ),
      6 => 
      array (
        'uniqueId' => 'Actions_SubmenuPageTitles',
        'name' => 'Page titles',
      ),
      7 => 
      array (
        'uniqueId' => 'General_Pages',
        'name' => 'Pages',
      ),
      8 => 
      array (
        'uniqueId' => 'Actions_SubmenuSitesearch',
        'name' => 'Site Search',
      ),
      9 => 
      array (
        'uniqueId' => 'Events_Events',
        'name' => 'Events',
      ),
      10 => 
      array (
        'uniqueId' => 'Contents_Contents',
        'name' => 'Contents',
      ),
      11 => 
      array (
        'uniqueId' => 'PagePerformance_Performance',
        'name' => 'Performance',
      ),
    ),
  ),
  1 => 
  array (
    'uniqueId' => 'General_Visitors',
    'name' => 'Visitors',
    'subcategories' => 
    array (
      0 => 
      array (
        'uniqueId' => 'DevicesDetection_Devices',
        'name' => 'Devices',
      ),
      1 => 
      array (
        'uniqueId' => 'DevicesDetection_Software',
        'name' => 'Software',
      ),
      2 => 
      array (
        'uniqueId' => 'General_Overview',
        'name' => 'Overview',
      ),
      3 => 
      array (
        'uniqueId' => 'UserCountry_SubmenuLocations',
        'name' => 'Locations',
      ),
      4 => 
      array (
        'uniqueId' => 'VisitTime_SubmenuTimes',
        'name' => 'Times',
      ),
      5 => 
      array (
        'uniqueId' => 'UserCountryMap_RealTimeMap',
        'name' => 'Real-time Map',
      ),
      6 => 
      array (
        'uniqueId' => 'General_RealTime',
        'name' => 'Real-time',
      ),
      7 => 
      array (
        'uniqueId' => 'Live_VisitorLog',
        'name' => 'Visits Log',
      ),
      8 => 
      array (
        'uniqueId' => 'UserId_UserReportTitle',
        'name' => 'User IDs',
      ),
      9 => 
      array (
        'uniqueId' => 'CustomVariables_CustomVariables',
        'name' => 'Custom Variables',
      ),
    ),
  ),
  2 => 
  array (
    'uniqueId' => 'Referrers_Referrers',
    'name' => 'Acquisition',
    'subcategories' => 
    array (
      0 => 
      array (
        'uniqueId' => 'Referrers_WidgetGetAll',
        'name' => 'All Channels',
      ),
      1 => 
      array (
        'uniqueId' => 'Referrers_URLCampaignBuilder',
        'name' => 'Campaign URL Builder',
      ),
      2 => 
      array (
        'uniqueId' => 'Referrers_Campaigns',
        'name' => 'Campaigns',
      ),
      3 => 
      array (
        'uniqueId' => 'General_Overview',
        'name' => 'Overview',
      ),
      4 => 
      array (
        'uniqueId' => 'Referrers_SubmenuSearchEngines',
        'name' => 'Search Engines & Keywords',
      ),
      5 => 
      array (
        'uniqueId' => 'Referrers_Socials',
        'name' => 'Social Networks',
      ),
      6 => 
      array (
        'uniqueId' => 'Referrers_SubmenuWebsitesOnly',
        'name' => 'Websites',
      ),
    ),
  ),
  3 => 
  array (
    'uniqueId' => 'Goals_Goals',
    'name' => 'Goals',
    'subcategories' => 
    array (
      0 => 
      array (
        'uniqueId' => 'Goals_AddNewGoal',
        'name' => 'Add a new Goal',
      ),
      1 => 
      array (
        'uniqueId' => 'General_Overview',
        'name' => 'Overview',
      ),
    ),
  ),
  4 => 
  array (
    'uniqueId' => 'FormAnalytics_Forms',
    'name' => 'Forms',
    'subcategories' => 
    array (
      0 => 
      array (
        'uniqueId' => '110',
        'name' => 'add-payment-account-form',
      ),
      1 => 
      array (
        'uniqueId' => '118',
        'name' => 'BonusHistoryForm',
      ),
      2 => 
      array (
        'uniqueId' => '112',
        'name' => 'edit-player-form',
      ),
      3 => 
      array (
        'uniqueId' => '116',
        'name' => 'MyRewardsHistoryForm',
      ),
      4 => 
      array (
        'uniqueId' => '117',
        'name' => 'RebatesHistoryForm',
      ),
      5 => 
      array (
        'uniqueId' => '115',
        'name' => 'redeem-loyalty-points-form',
      ),
      6 => 
      array (
        'uniqueId' => '114',
        'name' => 'refer-a-friend-form',
      ),
      7 => 
      array (
        'uniqueId' => '107',
        'name' => 'register-form',
      ),
      8 => 
      array (
        'uniqueId' => '113',
        'name' => 'reset-password-form',
      ),
      9 => 
      array (
        'uniqueId' => '109',
        'name' => 'transfer-create-form',
      ),
      10 => 
      array (
        'uniqueId' => 'General_Overview',
        'name' => 'Overview',
      ),
      11 => 
      array (
        'uniqueId' => 'FormAnalytics_TypeRealTime',
        'name' => 'Real-time',
      ),
    ),
  ),
  5 => 
  array (
    'uniqueId' => 'Funnels_Funnels',
    'name' => 'Funnels',
    'subcategories' => 
    array (
      0 => 
      array (
        'uniqueId' => 'General_Overview',
        'name' => 'Overview',
      ),
    ),
  ),
  6 => 
  array (
    'uniqueId' => 'HeatmapSessionRecording_Heatmaps',
    'name' => 'Heatmaps',
    'subcategories' => 
    array (
      0 => 
      array (
        'uniqueId' => 'HeatmapSessionRecording_GettingStarted',
        'name' => 'Getting Started',
      ),
    ),
  ),
  7 => 
  array (
    'uniqueId' => 'CustomReports_CustomReports',
    'name' => 'Custom Reports',
    'subcategories' => 
    array (
    ),
  ),
);