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, Aug 20', 'previousPages' => Piwik\DataTable::__set_state(array( 'rows' => array ( 0 => Piwik\DataTable\Row::__set_state(array( 'label' => 'forum.piwik.org/t/google-ban-for-malware-injection/18295', 'referrals' => 1, )), 1 => Piwik\DataTable\Row::__set_state(array( 'label' => 'forum.piwik.org/t/piwik-error-call-to-undefined-function-twig-lower-filter/11995', 'referrals' => 1, )), 2 => Piwik\DataTable\Row::__set_state(array( 'label' => 'forum.piwik.org/t/wrong-count-of-visits-the-detected-ip-is-not-the-users/25245/2', 'referrals' => 1, )), 3 => Piwik\DataTable\Row::__set_state(array( 'label' => 'forum.piwik.org/t/mit-piwik-umziehen-1-frage/4310', 'referrals' => 1, )), ), 'currentId' => 1, 'depthLevel' => 0, 'indexNotUpToDate' => true, 'rebuildIndexContinuously' => false, 'tableSortedBy' => false, 'queuedFilters' => array ( ), 'disabledFilters' => array ( ), 'rowsCountBeforeLimitFilter' => 0, 'enableRecursiveSort' => false, 'enableRecursiveFilters' => false, 'rowsIndexByLabel' => array ( ), 'summaryRow' => NULL, 'metadata' => array ( ), 'maximumAllowedRows' => 0, )), 'previousSiteSearches' => Piwik\DataTable::__set_state(array( 'rows' => array ( 0 => Piwik\DataTable\Row::__set_state(array( 'label' => 'export data hosting', 'referrals' => 1, )), ), 'currentId' => 2, 'depthLevel' => 0, 'indexNotUpToDate' => true, 'rebuildIndexContinuously' => false, 'tableSortedBy' => false, 'queuedFilters' => array ( ), 'disabledFilters' => array ( ), 'rowsCountBeforeLimitFilter' => 0, 'enableRecursiveSort' => false, 'enableRecursiveFilters' => false, 'rowsIndexByLabel' => array ( ), 'summaryRow' => NULL, 'metadata' => array ( ), 'maximumAllowedRows' => 0, )), 'pageMetrics' => array ( 'loops' => 6, 'pageviews' => 20, 'entries' => 9, 'exits' => 10, ), 'followingPages' => Piwik\DataTable::__set_state(array( 'rows' => array ( 0 => Piwik\DataTable\Row::__set_state(array( 'label' => 'forum.piwik.org/t/the-plugin-action-is-not-enabled/25260/2', 'referrals' => 1, )), 1 => Piwik\DataTable\Row::__set_state(array( 'label' => 'forum.piwik.org/c/support-bugs', 'referrals' => 1, )), 2 => Piwik\DataTable\Row::__set_state(array( 'label' => 'forum.piwik.org/c/deutschsprachiges-forum-support-in-german', 'referrals' => 1, )), ), 'currentId' => 3, 'depthLevel' => 0, 'indexNotUpToDate' => true, 'rebuildIndexContinuously' => false, 'tableSortedBy' => false, 'queuedFilters' => array ( ), 'disabledFilters' => array ( ), 'rowsCountBeforeLimitFilter' => 0, 'enableRecursiveSort' => false, 'enableRecursiveFilters' => false, 'rowsIndexByLabel' => array ( ), 'summaryRow' => NULL, 'metadata' => array ( ), 'maximumAllowedRows' => 0, )), 'followingSiteSearches' => Piwik\DataTable::__set_state(array( 'rows' => array ( 0 => Piwik\DataTable\Row::__set_state(array( 'label' => 'export data hosting', 'referrals' => 1, )), ), 'currentId' => 4, 'depthLevel' => 0, 'indexNotUpToDate' => true, 'rebuildIndexContinuously' => false, 'tableSortedBy' => false, 'queuedFilters' => array ( ), 'disabledFilters' => array ( ), 'rowsCountBeforeLimitFilter' => 0, 'enableRecursiveSort' => false, 'enableRecursiveFilters' => false, 'rowsIndexByLabel' => array ( ), 'summaryRow' => NULL, 'metadata' => array ( ), 'maximumAllowedRows' => 0, )), 'outlinks' => Piwik\DataTable::__set_state(array( 'rows' => array ( ), 'currentId' => 5, 'depthLevel' => 0, 'indexNotUpToDate' => true, 'rebuildIndexContinuously' => false, 'tableSortedBy' => false, 'queuedFilters' => array ( ), 'disabledFilters' => array ( ), 'rowsCountBeforeLimitFilter' => 0, 'enableRecursiveSort' => false, 'enableRecursiveFilters' => false, 'rowsIndexByLabel' => array ( ), 'summaryRow' => NULL, 'metadata' => array ( ), 'maximumAllowedRows' => 0, )), 'downloads' => Piwik\DataTable::__set_state(array( 'rows' => array ( ), 'currentId' => 6, 'depthLevel' => 0, 'indexNotUpToDate' => true, 'rebuildIndexContinuously' => false, 'tableSortedBy' => false, 'queuedFilters' => array ( ), 'disabledFilters' => array ( ), 'rowsCountBeforeLimitFilter' => 0, 'enableRecursiveSort' => false, 'enableRecursiveFilters' => false, 'rowsIndexByLabel' => array ( ), 'summaryRow' => NULL, 'metadata' => array ( ), 'maximumAllowedRows' => 0, )), 'referrers' => array ( 0 => array ( 'label' => 'Direct Entries', 'shortName' => 'direct', 'visits' => 3, 'details' => array ( ), ), 1 => array ( 'label' => 'From Websites', 'shortName' => 'website', 'visits' => 6, 'details' => array ( 0 => array ( 'label' => 'https://piwik.org/', 'referrals' => '2', ), 1 => array ( 'label' => 'https://piwik.org/integrate/', 'referrals' => '1', ), 2 => array ( 'label' => 'https://github.com/piwik/piwik/issues/11968', 'referrals' => '1', ), 3 => array ( 'label' => 'https://piwik.org/training/', 'referrals' => '1', ), 4 => array ( 'label' => 'https://piwik.org/faq/how-to-install/', 'referrals' => '1', ), ), ), ), );