Error: Data structure returned is not convertible in the requested format: Multidimensional column values not supported. Found unexpected array value for column 'steps' in row '0': 'array (
  0 => 
  array (
    'position' => 1,
    'name' => 'Job board',
    'pattern_type' => 'path_contains',
    'pattern' => '/jobs/',
    'required' => true,
  ),
)'. Try to call this method with the parameters '&format=original&serialize=1'; you will get the original php data structure serialized.