Error: Data structure returned is not convertible in the requested format: Only integer keys supported for array columns on base level. Unsupported string 'steps' found for row 'array (
  0 => 
  array (
    'position' => 1,
    'name' => 'Homepage',
    'pattern_type' => 'path_equals',
    'pattern' => '/',
    'required' => false,
  ),
  1 => 
  array (
    'position' => 2,
    'name' => '50% off scuba diving masks promotion',
    'pattern_type' => 'path_equals',
    'pattern' => '/promotion/50-off-scuba-diving-masks',
    'required' => true,
  ),
  2 => 
  array (
    'position' => 3,
    'name' => 'Item added to cart',
    'pattern_type' => 'eventname_equals',
    ''. Try to call this method with the parameters '&format=original&serialize=1'; you will get the original php data structure serialized.