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 (
  'date' => 'Sun, May 19',
  'previousPages' => 
  \Piwik\DataTable::__set_state(array(
     'rows' => 
    array (
    ),
     'currentId' => 1,
     'depthLevel' => 0,
     'indexNotUpToDate' => true,
     'rebuildIndexContinuously' => false,
     'tableSortedBy' => false,
     'queuedFilters' => 
    array (
    ),
     'disabledFilters' => 
    array (
    ),
     'rowsCountBeforeLimitFilter' => 0,
     'enableRecursiveSort' => false,
     'enableRecursiveFilters' => false,
     'rowsIndexByLabel' => 
    array (
    ),
     'summaryRow' => NULL,
     'totalsRow' => NULL,
     'metadata' => 
    array (
    ),
     'maximumAllowedRows' => 0,
  )),
  'previousSiteSearches' => 
  \Piwik\DataTable::__set_state(array(
     'rows' => 
    array (
    ),
     'currentId' => 2,
     'depthLevel' => 0,
     'indexNotUpToDate' => true,
     'rebuildIndexContinuously' => false,
     'tableSortedBy' => false,
     'queuedFilters' => 
    array (
    ),
     'disabledFilters' => 
    array (
    ),
     'rowsCountBeforeLimitFilter' => 0,
     'enableRecursiveSort' => false,
     'enableRecursiveFilters' => false,
     'rowsIndexByLabel' => 
    array (
    ),
     'summaryRow' => NULL,
     'totalsRow' => NULL,
     'metadata' => 
    array (
    ),
     'maximumAllowedRows' => 0,
  )),
  'pageMetrics' => 
  array (
    'loops' => 2,
    'pageviews' => 2,
    'entries' => 2,
    'exits' => -269,
  ),
  'followingPages' => 
  \Piwik\DataTable::__set_state(array(
     'rows' => 
    array (
      0 => 
      \Piwik\DataTable\Row::__set_state(array(
         'label' => 'cvlpress.ro/',
         'referrals' => 118,
      )),
      1 => 
      \Piwik\DataTable\Row::__set_state(array(
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         'referrals' => 29,
      )),
      2 => 
      \Piwik\DataTable\Row::__set_state(array(
         'label' => 'cvlpress.ro/17.05.2024/concurs-interjudetean-de-matematica-la-colegiul-national-carol-i-din-craiova/',
         'referrals' => 26,
      )),
      3 => 
      \Piwik\DataTable\Row::__set_state(array(
         'label' => 'cvlpress.ro/category/sport/',
         'referrals' => 16,
      )),
      4 => 
      \Piwik\DataTable\Row::__set_state(array(
         'label' => 'cvlpress.ro/18.05.2024/leverkusen-neinvinsa-in-tot-sezonul-de-bundesliga/',
         'referrals' => 8,
      )),
      5 => 
      \Piwik\DataTable\Row::__set_state(array(
         'label' => 'Others',
         'referrals' => 72,
      )),
    ),
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     'tableSortedBy' => false,
     'queuedFilters' => 
    array (
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     'disabledFilters' => 
    array (
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     'rowsCountBeforeLimitFilter' => 0,
     'enableRecursiveSort' => false,
     'enableRecursiveFilters' => false,
     'rowsIndexByLabel' => 
    array (
    ),
     'summaryRow' => NULL,
     'totalsRow' => NULL,
     'metadata' => 
    array (
    ),
     'maximumAllowedRows' => 0,
  )),
  'followingSiteSearches' => 
  \Piwik\DataTable::__set_state(array(
     'rows' => 
    array (
    ),
     'currentId' => 4,
     'depthLevel' => 0,
     'indexNotUpToDate' => true,
     'rebuildIndexContinuously' => false,
     'tableSortedBy' => false,
     'queuedFilters' => 
    array (
    ),
     'disabledFilters' => 
    array (
    ),
     'rowsCountBeforeLimitFilter' => 0,
     'enableRecursiveSort' => false,
     'enableRecursiveFilters' => false,
     'rowsIndexByLabel' => 
    array (
    ),
     'summaryRow' => NULL,
     'totalsRow' => NULL,
     'metadata' => 
    array (
    ),
     'maximumAllowedRows' => 0,
  )),
  'outlinks' => 
  \Piwik\DataTable::__set_state(array(
     'rows' => 
    array (
      0 => 
      \Piwik\DataTable\Row::__set_state(array(
         'label' => 'http://www.mondotexte.0n.ro/',
         'referrals' => 1,
      )),
      1 => 
      \Piwik\DataTable\Row::__set_state(array(
         'label' => 'https://www.linkedin.com/shareArticle?mini=true&url=https://cvlpress.ro/19.05.2024/stiinta-incheie-campionatul-cu-victorie-si-pe-podium/&title=Ştiinţa încheie campionatul cu victorie şi pe podium',
         'referrals' => 1,
      )),
    ),
     'currentId' => 5,
     'depthLevel' => 0,
     'indexNotUpToDate' => true,
     'rebuildIndexContinuously' => false,
     'tableSortedBy' => false,
     'queuedFilters' => 
    array (
    ),
     'disabledFilters' => 
    array (
    ),
     'rowsCountBeforeLimitFilter' => 0,
     'enableRecursiveSort' => false,
     'enableRecursiveFilters' => false,
     'rowsIndexByLabel' => 
    array (
    ),
     'summaryRow' => NULL,
     'totalsRow' => NULL,
     'metadata' => 
    array (
    ),
     'maximumAllowedRows' => 0,
  )),
  'downloads' => 
  \Piwik\DataTable::__set_state(array(
     'rows' => 
    array (
      0 => 
      \Piwik\DataTable\Row::__set_state(array(
         'label' => 'https://www.cvlpress.ro/wp-content/uploads/2013/07/berceanu-1.jpg',
         'referrals' => 1,
      )),
      1 => 
      \Piwik\DataTable\Row::__set_state(array(
         'label' => 'https://www.cvlpress.ro/wp-content/uploads/2013/07/berceanu.jpg',
         'referrals' => 1,
      )),
    ),
     'currentId' => 6,
     'depthLevel' => 0,
     'indexNotUpToDate' => true,
     'rebuildIndexContinuously' => false,
     'tableSortedBy' => false,
     'queuedFilters' => 
    array (
    ),
     'disabledFilters' => 
    array (
    ),
     'rowsCountBeforeLimitFilter' => 0,
     'enableRecursiveSort' => false,
     'enableRecursiveFilters' => false,
     'rowsIndexByLabel' => 
    array (
    ),
     'summaryRow' => NULL,
     'totalsRow' => NULL,
     'metadata' => 
    array (
    ),
     'maximumAllowedRows' => 0,
  )),
  'referrers' => 
  array (
    0 => 
    array (
      'label' => 'Direct entries',
      'shortName' => 'direct',
      'visits' => 2,
      'details' => 
      array (
      ),
    ),
  ),
);