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 (
    'idexperiment' => '9',
    'idsite' => '1',
    'confidence_threshold' => '95.0',
    'mde_relative' => '15',
    'name' => 'AffiliateLinkEffectiveness',
    'description' => 'Comparing overall effectiveness of different ads on diving pages.',
    'hypothesis' => 'If I remove one of the affiliate links/ads on the diving pages, then I will not see a decrease in conversions, because they are not effective and thus could be removed/changed.',
    'included_targets' => 
    array (
      0 => 
      array (
        'attribute' => 'path',
        'inverted' => '0',
        'type' => 'starts_with',
        'value' => '/diving/',
      ),
    ),
    'excluded_targets' => 
    array (
    ),
    'success_metrics' => 
    array (
      0 => 
      array (
        'metric' => 'nb_conversions_goal_7',
      ),
    ),
    'percentage_participants' => '100',
    'original_redirect_url' => NULL,
    'status' => 'running',
    'start_date' => '2018-05-01 19:46:49',
    'modified_date' => '2018-06-12 19:46:49',
    'end_date' => NULL,
    'variations' => 
    array (
      0 => 
      array (
        'idvariation' => '21',
        'name' => 'WithoutLastAd',
        'percentage' => NULL,
        'redirect_url' => NULL,
      ),
      1 => 
      array (
        'idvariation' => '22',
        'name' => 'WithoutRightSidebarLink',
        'percentage' => NULL,
        'redirect_url' => NULL,
      ),
      2 => 
      array (
        'idvariation' => '23',
        'name' => 'WithoutGoogleAds',
        'percentage' => NULL,
        'redirect_url' => NULL,
      ),
    ),
    'start_date_site_timezone' => '2018-05-01 21:46:49',
    'end_date_site_timezone' => NULL,
    'date_range_string' => '2018-05-01,2023-03-23',
    'duration' => '1786 days and 14 hours',
  ),
  1 => 
  array (
    'idexperiment' => '10',
    'idsite' => '1',
    'confidence_threshold' => '95.0',
    'mde_relative' => '15',
    'name' => 'IDivedThereLinkMove',
    'description' => 'Compare link target of "I dived there" button.',
    'hypothesis' => 'If the "I dived there" button links to the actual comment form instead of the start of the comment section, then there will be more comments, because users will be able to see the form.',
    'included_targets' => 
    array (
      0 => 
      array (
        'attribute' => 'url',
        'inverted' => '0',
        'type' => 'contains',
        'value' => '/diving/',
      ),
    ),
    'excluded_targets' => 
    array (
    ),
    'success_metrics' => 
    array (
      0 => 
      array (
        'metric' => 'nb_conversions_goal_9',
      ),
    ),
    'percentage_participants' => '100',
    'original_redirect_url' => NULL,
    'status' => 'running',
    'start_date' => '2018-05-01 11:30:39',
    'modified_date' => '2018-06-14 11:30:39',
    'end_date' => NULL,
    'variations' => 
    array (
      0 => 
      array (
        'idvariation' => '24',
        'name' => 'LinkToCommentForm',
        'percentage' => NULL,
        'redirect_url' => NULL,
      ),
    ),
    'start_date_site_timezone' => '2018-05-01 13:30:39',
    'end_date_site_timezone' => NULL,
    'date_range_string' => '2018-05-01,2023-03-23',
    'duration' => '1786 days and 22 hours',
  ),
  2 => 
  array (
    'idexperiment' => '11',
    'idsite' => '1',
    'confidence_threshold' => '95.0',
    'mde_relative' => '15',
    'name' => 'JobsListingCallToActionChange',
    'description' => 'Compare user oriented vs action oriented call to actions.',
    'hypothesis' => 'If I change the call to actions on the job listing page to be user oriented instead of action oriented, then there will be more job postings.',
    'included_targets' => 
    array (
      0 => 
      array (
        'attribute' => 'url',
        'inverted' => '0',
        'type' => 'equals_simple',
        'value' => 'https://divezone.net/jobs',
      ),
    ),
    'excluded_targets' => 
    array (
    ),
    'success_metrics' => 
    array (
      0 => 
      array (
        'metric' => 'nb_conversions_goal_5',
      ),
    ),
    'percentage_participants' => '100',
    'original_redirect_url' => NULL,
    'status' => 'running',
    'start_date' => '2018-05-01 11:28:04',
    'modified_date' => '2018-06-14 11:28:04',
    'end_date' => NULL,
    'variations' => 
    array (
      0 => 
      array (
        'idvariation' => '25',
        'name' => 'UserOrientedCTA',
        'percentage' => NULL,
        'redirect_url' => NULL,
      ),
    ),
    'start_date_site_timezone' => '2018-05-01 13:28:04',
    'end_date_site_timezone' => NULL,
    'date_range_string' => '2018-05-01,2023-03-23',
    'duration' => '1786 days and 22 hours',
  ),
  3 => 
  array (
    'idexperiment' => '12',
    'idsite' => '1',
    'confidence_threshold' => '95.0',
    'mde_relative' => '15',
    'name' => 'JobPageRelevantCallToAction',
    'description' => 'Remove top two CTAs on individual job page & replace w/ 'Apply now!' CTA.',
    'hypothesis' => 'If I change the top CTAs on the individual job page to be an action about the job, then more users will apply to jobs.',
    'included_targets' => 
    array (
      0 => 
      array (
        'attribute' => 'url',
        'inverted' => '0',
        'type' => 'contains',
        'value' => '/jobs/view/',
      ),
    ),
    'excluded_targets' => 
    array (
    ),
    'success_metrics' => 
    array (
      0 => 
      array (
        'metric' => 'nb_conversions_goal_4',
      ),
    ),
    'percentage_participants' => '100',
    'original_redirect_url' => NULL,
    'status' => 'running',
    'start_date' => '2018-05-01 11:28:12',
    'modified_date' => '2018-06-14 11:28:12',
    'end_date' => NULL,
    'variations' => 
    array (
      0 => 
      array (
        'idvariation' => '26',
        'name' => 'ApplyNow',
        'percentage' => NULL,
        'redirect_url' => NULL,
      ),
    ),
    'start_date_site_timezone' => '2018-05-01 13:28:12',
    'end_date_site_timezone' => NULL,
    'date_range_string' => '2018-05-01,2023-03-23',
    'duration' => '1786 days and 22 hours',
  ),
  4 => 
  array (
    'idexperiment' => '13',
    'idsite' => '1',
    'confidence_threshold' => '95.0',
    'mde_relative' => '15',
    'name' => 'DivingPageTitles',
    'description' => 'Comparing different titles for the diving page.',
    'hypothesis' => 'If I change the title of diving pages, I will see more affiliate link clicks, because users will be more engaged.',
    'included_targets' => 
    array (
      0 => 
      array (
        'attribute' => 'url',
        'inverted' => '0',
        'type' => 'contains',
        'value' => '/diving/',
      ),
    ),
    'excluded_targets' => 
    array (
    ),
    'success_metrics' => 
    array (
      0 => 
      array (
        'metric' => 'nb_conversions_goal_7',
      ),
    ),
    'percentage_participants' => '100',
    'original_redirect_url' => NULL,
    'status' => 'running',
    'start_date' => '2018-05-01 11:03:54',
    'modified_date' => '2018-06-15 11:03:54',
    'end_date' => NULL,
    'variations' => 
    array (
      0 => 
      array (
        'idvariation' => '27',
        'name' => 'Plain',
        'percentage' => NULL,
        'redirect_url' => NULL,
      ),
      1 => 
      array (
        'idvariation' => '28',
        'name' => 'Remarkable',
        'percentage' => NULL,
        'redirect_url' => NULL,
      ),
      2 => 
      array (
        'idvariation' => '29',
        'name' => 'Exciting',
        'percentage' => NULL,
        'redirect_url' => NULL,
      ),
    ),
    'start_date_site_timezone' => '2018-05-01 13:03:54',
    'end_date_site_timezone' => NULL,
    'date_range_string' => '2018-05-01,2023-03-23',
    'duration' => '1786 days and 23 hours',
  ),
);