Class 'views_handler_field' not found

In #267427: Views2 integration, webchick provided a patch to Taxonomy Image to support Views 2. When I test it, I get:

PHP Fatal error: Class 'views_handler_field' not found in C:\\www\\drupal-6\\sites\\all\\modules\\contrib\\taxonomy_image\\taxonomy_image_views.inc on line 42, referer: http://d6/admin/build/views

Yes, I clear the Views cache every time I visit the Views page.

After reading #239711: Class 'views_handler_field_node' not found, I downloaded the most recent -dev version (Aug 26) and re-tested with the same error. Since that issue mentioned that module order might be involved, I set Taxonomy Image's module weight to 2 higher than Views 2. I still get this error.

AFAICT, there are no other modules at play here. I am using Drupal 6.4, PHP 5.2.0, and MySql 5.0.23.

The exact code is:

<?php
// $Id: taxonomy_image_views.inc,v 1.1.2.1 2008/08/27 16:23:33 nancyw Exp $

/**
 * @file
 * Views integration for Taxonomy Image module.
 */

/**
 * Implementation of hook_views_data().
 */
function taxonomy_image_views_data() {
  // Table definition.
  $data['term_image']['table']['group'] = t('Taxonomy');

  // Joins.
  $data['term_image']['table']['join'] = array(
    'term_data' => array(
      // Links directly to term_data via tid.
      'left_field' => 'tid',
      'field' => 'tid',
    ),
  );

  // Fields.
  $data['term_image']['path'] = array(
    'title' => t('Term image'),
    'help' => t("The image associated with a taxonomy term."),
    'field' => array(
      'handler' => 'views_handler_field_taxonomy_image',
    ),
  );

  return $data;
}

/**
 * Field handler to provide an embedded image.
 *
 * @ingroup views_field_handlers
 */
class views_handler_field_taxonomy_image extends views_handler_field {

  /**
   * Define options available for this field.
   */
  function option_definition() {
    $options = parent::option_definition();

    $options['imagecache_preset'] = array('default' => '');
    $options['link_to_taxonomy'] = array('default' => FALSE);

    return $options;
  }

  /**
   * Build option configuration form.
   */
  function options_form(&$form, &$form_state) {
    parent::options_form($form, $form_state);

    $form['link_to_taxonomy'] = array(
      '#title' => t('Link this image to its term page'),
      '#type' => 'checkbox',
      '#default_value' => !empty($this->options['link_to_taxonomy']),
    );

    // If ImageCache module is found, add its presets as available options
    // for how to display the image.
    if (module_exists('imagecache')) {
      $raw_presets = imagecache_presets();
      $presets[''] = t('Default');
      foreach ($raw_presets as $preset_id => $preset_info) {
        $preset = $preset_info['presetname'];
        $presets[$preset] = $preset;
      }
      $form['imagecache_preset'] = array(
        '#type' => 'select',
        '#title' => t('ImageCache preset'),
        '#options' => $presets,
        '#default_value' => $this->options['imagecache_preset'],
      );
    }
  }

  /**
   * Render field output to the browser.
   */
  function render($values) {
    $image = '';

    // Render image. If ImageCache preset is specified, use it.
    if ($this->options['imagecache_preset']) {
      $image = taxonomy_image_display($values->tid, NULL, $this->options['imagecache_preset']);
    }
    else {
      $image = taxonomy_image_display($values->tid);
    }

    // Output image as a link, if option is set.
    if ($this->options['link_to_taxonomy']) {
      $image = l($image, taxonomy_term_path(taxonomy_get_term($values->tid)), array('html' => TRUE));
    }

    return $image;
  }

}