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  <result><error message="API returned an error: Trying to add two strings in DataTable\Row::sumRowArray: '33.33%' + '100%' for row # ['label' => 'Unknown', 'nb_uniq_visitors' => 7, 'nb_visits' => 7, 'nb_actions' => 16, 'nb_users' => 0, 'max_actions' => 6, 'sum_visit_length' => 316, 'bounce_count' => 3, 'nb_visits_converted' => 0, 'conversion_rate' => , 'nb_actions_per_visit' => 3.5, 'avg_time_on_site' => 53, 'bounce_rate' => '33.33%'] ['url' => ] [idsubtable = ]<br />  at Row.php:644 "/></result>