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 (
  'date' =&gt; 'Fri, May 3',
  'previousPages' =&gt; 
  Piwik\DataTable::__set_state(array(
     'rows' =&gt; 
    array (
    ),
     'currentId' =&gt; 1,
     'depthLevel' =&gt; 0,
     'indexNotUpToDate' =&gt; true,
     'rebuildIndexContinuously' =&gt; false,
     'tableSortedBy' =&gt; false,
     'queuedFilters' =&gt; 
    array (
    ),
     'disabledFilters' =&gt; 
    array (
    ),
     'rowsCountBeforeLimitFilter' =&gt; 0,
     'enableRecursiveSort' =&gt; false,
     'enableRecursiveFilters' =&gt; false,
     'rowsIndexByLabel' =&gt; 
    array (
    ),
     'summaryRow' =&gt; NULL,
     'totalsRow' =&gt; NULL,
     'metadata' =&gt; 
    array (
    ),
     'maximumAllowedRows' =&gt; 0,
  )),
  'previousSiteSearches' =&gt; 
  Piwik\DataTable::__set_state(array(
     'rows' =&gt; 
    array (
    ),
     'currentId' =&gt; 2,
     'depthLevel' =&gt; 0,
     'indexNotUpToDate' =&gt; true,
     'rebuildIndexContinuously' =&gt; false,
     'tableSortedBy' =&gt; false,
     'queuedFilters' =&gt; 
    array (
    ),
     'disabledFilters' =&gt; 
    array (
    ),
     'rowsCountBeforeLimitFilter' =&gt; 0,
     'enableRecursiveSort' =&gt; false,
     'enableRecursiveFilters' =&gt; false,
     'rowsIndexByLabel' =&gt; 
    array (
    ),
     'summaryRow' =&gt; NULL,
     'totalsRow' =&gt; NULL,
     'metadata' =&gt; 
    array (
    ),
     'maximumAllowedRows' =&gt; 0,
  )),
  'pageMetrics' =&gt; 
  array (
    'loops' =&gt; 1,
    'pageviews' =&gt; 1,
    'entries' =&gt; 1,
    'exits' =&gt; -3917,
  ),
  'followingPages' =&gt; 
  Piwik\DataTable::__set_state(array(
     'rows' =&gt; 
    array (
      0 =&gt; 
      Piwik\DataTable\Row::__set_state(array(
         'label' =&gt; 'nosdeputes.fr/groupe/LFI',
         'referrals' =&gt; 252,
      )),
      1 =&gt; 
      Piwik\DataTable\Row::__set_state(array(
         'label' =&gt; 'nosdeputes.fr/',
         'referrals' =&gt; 159,
      )),
      2 =&gt; 
      Piwik\DataTable\Row::__set_state(array(
         'label' =&gt; 'nosdeputes.fr/groupe/RN',
         'referrals' =&gt; 98,
      )),
      3 =&gt; 
      Piwik\DataTable\Row::__set_state(array(
         'label' =&gt; 'nosdeputes.fr/circonscription',
         'referrals' =&gt; 77,
      )),
      4 =&gt; 
      Piwik\DataTable\Row::__set_state(array(
         'label' =&gt; 'nosdeputes.fr/synthese',
         'referrals' =&gt; 54,
      )),
      5 =&gt; 
      Piwik\DataTable\Row::__set_state(array(
         'label' =&gt; 'Others',
         'referrals' =&gt; 3277,
      )),
    ),
     'currentId' =&gt; 3,
     'depthLevel' =&gt; 0,
     'indexNotUpToDate' =&gt; true,
     'rebuildIndexContinuously' =&gt; false,
     'tableSortedBy' =&gt; false,
     'queuedFilters' =&gt; 
    array (
    ),
     'disabledFilters' =&gt; 
    array (
    ),
     'rowsCountBeforeLimitFilter' =&gt; 0,
     'enableRecursiveSort' =&gt; false,
     'enableRecursiveFilters' =&gt; false,
     'rowsIndexByLabel' =&gt; 
    array (
    ),
     'summaryRow' =&gt; NULL,
     'totalsRow' =&gt; NULL,
     'metadata' =&gt; 
    array (
    ),
     'maximumAllowedRows' =&gt; 0,
  )),
  'followingSiteSearches' =&gt; 
  Piwik\DataTable::__set_state(array(
     'rows' =&gt; 
    array (
    ),
     'currentId' =&gt; 4,
     'depthLevel' =&gt; 0,
     'indexNotUpToDate' =&gt; true,
     'rebuildIndexContinuously' =&gt; false,
     'tableSortedBy' =&gt; false,
     'queuedFilters' =&gt; 
    array (
    ),
     'disabledFilters' =&gt; 
    array (
    ),
     'rowsCountBeforeLimitFilter' =&gt; 0,
     'enableRecursiveSort' =&gt; false,
     'enableRecursiveFilters' =&gt; false,
     'rowsIndexByLabel' =&gt; 
    array (
    ),
     'summaryRow' =&gt; NULL,
     'totalsRow' =&gt; NULL,
     'metadata' =&gt; 
    array (
    ),
     'maximumAllowedRows' =&gt; 0,
  )),
  'outlinks' =&gt; 
  Piwik\DataTable::__set_state(array(
     'rows' =&gt; 
    array (
      0 =&gt; 
      Piwik\DataTable\Row::__set_state(array(
         'label' =&gt; 'http://www.assemblee-nationale.fr/16/propositions/pion2542.asp',
         'referrals' =&gt; 1,
      )),
      1 =&gt; 
      Piwik\DataTable\Row::__set_state(array(
         'label' =&gt; 'https://2022.nosdeputes.fr/deputes',
         'referrals' =&gt; 1,
      )),
      2 =&gt; 
      Piwik\DataTable\Row::__set_state(array(
         'label' =&gt; 'https://fr.wikipedia.org/wiki/Mereana Reid Arbelot',
         'referrals' =&gt; 1,
      )),
      3 =&gt; 
      Piwik\DataTable\Row::__set_state(array(
         'label' =&gt; 'https://videos.assemblee-nationale.fr/video.12590991_638f72b9392a9?timecode=5400720',
         'referrals' =&gt; 1,
      )),
      4 =&gt; 
      Piwik\DataTable\Row::__set_state(array(
         'label' =&gt; 'https://www.regardscitoyens.org/nosdeputes-fr-cest-reparti-pour-un-dernier-tour',
         'referrals' =&gt; 1,
      )),
      5 =&gt; 
      Piwik\DataTable\Row::__set_state(array(
         'label' =&gt; 'Others',
         'referrals' =&gt; 1,
      )),
    ),
     'currentId' =&gt; 5,
     'depthLevel' =&gt; 0,
     'indexNotUpToDate' =&gt; true,
     'rebuildIndexContinuously' =&gt; false,
     'tableSortedBy' =&gt; false,
     'queuedFilters' =&gt; 
    array (
    ),
     'disabledFilters' =&gt; 
    array (
    ),
     'rowsCountBeforeLimitFilter' =&gt; 0,
     'enableRecursiveSort' =&gt; false,
     'enableRecursiveFilters' =&gt; false,
     'rowsIndexByLabel' =&gt; 
    array (
    ),
     'summaryRow' =&gt; NULL,
     'totalsRow' =&gt; NULL,
     'metadata' =&gt; 
    array (
    ),
     'maximumAllowedRows' =&gt; 0,
  )),
  'downloads' =&gt; 
  Piwik\DataTable::__set_state(array(
     'rows' =&gt; 
    array (
    ),
     'currentId' =&gt; 6,
     'depthLevel' =&gt; 0,
     'indexNotUpToDate' =&gt; true,
     'rebuildIndexContinuously' =&gt; false,
     'tableSortedBy' =&gt; false,
     'queuedFilters' =&gt; 
    array (
    ),
     'disabledFilters' =&gt; 
    array (
    ),
     'rowsCountBeforeLimitFilter' =&gt; 0,
     'enableRecursiveSort' =&gt; false,
     'enableRecursiveFilters' =&gt; false,
     'rowsIndexByLabel' =&gt; 
    array (
    ),
     'summaryRow' =&gt; NULL,
     'totalsRow' =&gt; NULL,
     'metadata' =&gt; 
    array (
    ),
     'maximumAllowedRows' =&gt; 0,
  )),
  'referrers' =&gt; 
  array (
    0 =&gt; 
    array (
      'label' =&gt; 'Direct Entries',
      'shortName' =&gt; 'direct',
      'visits' =&gt; 1,
      'details' =&gt; 
      array (
      ),
    ),
  ),
);