Importing View from 5.19 to 6.13 Filter Handler Issues

Hi,

First of all I'm new to Views, so I may be missing something obvious.

I'm upgrading a site from 5 to 6 and when trying to import a view I keep getting this error:

    * Filter handler node_data_field_roastlog_products.field_roastlog_products_value_default is not available.
    * Filter handler . is not available.
    * Filter handler node_data_field_roastlog_products.field_roastlog_products_value_default is not available.
    * Filter handler . is not available.
    * Unable to import view.

Here's the view code

  $view = new stdClass();
  $view->name = 'roast_log';
  $view->description = 'Roast log';
  $view->access = array (
  0 => '11',
  1 => '7',
);
  $view->view_args_php = '';
  $view->page = TRUE;
  $view->page_title = 'Roast log';
  $view->page_header = '';
  $view->page_header_format = '3';
  $view->page_footer = '';
  $view->page_footer_format = '3';
  $view->page_empty = '';
  $view->page_empty_format = '3';
  $view->page_type = 'table';
  $view->url = 'roast/nest';
  $view->use_pager = TRUE;
  $view->nodes_per_page = '100';
  $view->sort = array (
  );
  $view->argument = array (
  );
  $view->field = array (
    array (
      'tablename' => 'node',
      'field' => 'title',
      'label' => 'Roast #',
      'handler' => 'views_handler_field_nodelink',
      'sortable' => '1',
      'defaultsort' => 'DESC',
      'options' => 'link',
    ),
    array (
      'tablename' => 'node_data_field_roastlog_products',
      'field' => 'field_roastlog_products_value',
      'label' => 'Roast type',
      'handler' => 'content_views_field_handler_group',
      'sortable' => '1',
      'options' => 'default',
    ),
    array (
      'tablename' => 'node',
      'field' => 'created',
      'label' => 'Date',
      'handler' => 'views_handler_field_date_custom',
      'options' => 'M j, Y, H:i',
    ),
    array (
      'tablename' => 'node_data_field_roastlog_worker',
      'field' => 'field_roastlog_worker_uid',
      'label' => 'Worker',
      'handler' => 'content_views_field_handler_group',
      'options' => 'default',
    ),
    array (
      'tablename' => 'node_data_field_description',
      'field' => 'field_description_value',
      'label' => 'Notes',
      'handler' => 'content_views_field_handler_group',
      'options' => 'default',
    ),
  );
  $view->filter = array (
    array (
      'tablename' => 'node',
      'field' => 'type',
      'operator' => 'OR',
      'options' => '',
      'value' => array (
  0 => 'content_roast_log',
),
    ),
    array (
      'tablename' => 'node',
      'field' => 'title',
      'operator' => '=',
      'options' => '',
      'value' => '',
    ),
    array (
      'tablename' => 'node_data_field_roastlog_products',
      'field' => 'field_roastlog_products_value_default',
      'operator' => 'OR',
      'options' => '',
      'value' => array (
  0 => 'Bolivia 442',
  1 => 'Bolivia 470',
  2 => 'Colombia 448',
  3 => 'Colombia 470',
),
    ),
  );
  $view->exposed_filter = array (
    array (
      'tablename' => 'node_data_field_roastlog_products',
      'field' => 'field_roastlog_products_value_default',
      'label' => 'Filter by roast type',
      'optional' => '1',
      'is_default' => '0',
      'operator' => '1',
      'single' => '1',
    ),
  );
  $view->requires = array(node, node_data_field_roastlog_products, node_data_field_roastlog_worker, node_data_field_description);
  $views[$view->name] = $view;

Just looking for a point in the right direction.

Thanks!