Page not found error for panels page

Thanks for looking at this, Earl - you rock.

I added a static URL element at the beginning of the path, but I still get no page found. The two arguments are each taxonomy terms from different vocabularies, if that makes a difference.

Here's the page export:

$page = new stdClass;
$page->disabled = FALSE; /* Edit this to true to make a default page disabled initially */
$page->api_version = 1;
$page->name = 'product_page';
$page->task = 'page';
$page->admin_title = 'Product Page';
$page->admin_description = '';
$page->path = 'learn/%productline/%platform';
$page->access = array(
  'plugins' => array(),
  'logic' => 'and',
);
$page->menu = array(
  'type' => 'none',
  'title' => '%productline',
  'name' => 'primary-links',
  'weight' => '0',
  'parent' => array(
    'type' => 'none',
    'title' => '',
    'name' => 'navigation',
    'weight' => '0',
  ),
);
$page->arguments = array(
  'productline' => array(
    'id' => 1,
    'identifier' => 'Taxonomy term: Product line',
    'name' => 'term',
    'settings' => array(
      'input_form' => 'term',
      'vids' => array(
        2 => 2,
        1 => 0,
        4 => 0,
        3 => 0,
      ),
      'breadcrumb' => 0,
    ),
  ),
  'platform' => array(
    'id' => 2,
    'identifier' => 'Taxonomy term: Platform',
    'name' => 'term',
    'settings' => array(
      'input_form' => 'term',
      'vids' => array(
        3 => 3,
        1 => 0,
        4 => 0,
        2 => 0,
      ),
      'breadcrumb' => 1,
    ),
  ),
);
$page->conf = array();
$page->default_handlers = array();
$handler = new stdClass;
$handler->disabled = FALSE; /* Edit this to true to make a default handler disabled initially */
$handler->api_version = 1;
$handler->name = 'page_product_page_panel_context';
$handler->task = 'page';
$handler->subtask = 'product_page';
$handler->handler = 'panel_context';
$handler->weight = 0;
$handler->conf = array(
  'title' => 'Product Page Panel',
  'no_blocks' => 0,
  'pipeline' => 'standard',
  'css_id' => '',
  'css' => '',
  'contexts' => array(),
  'relationships' => array(),
);
$display = new panels_display;
$display->api_version = 1;
$display->layout = 'twocol_stacked';
$display->layout_settings = array();
$display->panel_settings = array(
  'style_settings' => array(
    'default' => NULL,
    'center' => NULL,
    'top' => NULL,
    'left' => NULL,
    'right' => NULL,
    'bottom' => NULL,
  ),
);
$display->cache = array();
$display->title = '';
$display->content = array();
$display->panels = array();
  $pane = new stdClass;
  $pane->api_version = 1;
  $pane->pid = 'new-1';
  $pane->panel = 'left';
  $pane->type = 'views';
  $pane->subtype = 'product_line_features';
  $pane->shown = TRUE;
  $pane->access = array();
  $pane->configuration = array(
    'override_pager_settings' => 0,
    'use_pager' => 0,
    'nodes_per_page' => '10',
    'pager_id' => '',
    'offset' => '0',
    'more_link' => 0,
    'feed_icons' => 0,
    'panel_args' => 1,
    'link_to_view' => 0,
    'args' => '',
    'url' => '',
    'display' => 'block_1',
    'context' => array(
      0 => 'argument_term_1.name',
    ),
    'override_title' => 0,
    'override_title_text' => '',
  );
  $pane->cache = array();
  $pane->style = array(
    'settings' => NULL,
  );
  $pane->css = array();
  $pane->extras = array();
  $pane->position = 0;
  $display->content['new-1'] = $pane;
  $display->panels['left'][0] = 'new-1';
  $pane = new stdClass;
  $pane->api_version = 1;
  $pane->pid = 'new-2';
  $pane->panel = 'right';
  $pane->type = 'views';
  $pane->subtype = 'product_platform_details';
  $pane->shown = TRUE;
  $pane->access = array();
  $pane->configuration = array(
    'override_pager_settings' => 0,
    'use_pager' => 0,
    'nodes_per_page' => '10',
    'pager_id' => '',
    'offset' => '0',
    'more_link' => 0,
    'feed_icons' => 0,
    'panel_args' => 0,
    'link_to_view' => 0,
    'args' => '',
    'url' => '',
    'display' => 'default',
    'context' => array(
      0 => 'argument_term_1.name',
      1 => 'argument_term_2.name',
    ),
    'override_title' => 0,
    'override_title_text' => '',
  );
  $pane->cache = array();
  $pane->style = array(
    'settings' => NULL,
  );
  $pane->css = array();
  $pane->extras = array();
  $pane->position = 0;
  $display->content['new-2'] = $pane;
  $display->panels['right'][0] = 'new-2';
  $pane = new stdClass;
  $pane->api_version = 1;
  $pane->pid = 'new-3';
  $pane->panel = 'top';
  $pane->type = 'views';
  $pane->subtype = 'product_line_features';
  $pane->shown = TRUE;
  $pane->access = array();
  $pane->configuration = array(
    'override_pager_settings' => 0,
    'use_pager' => 0,
    'nodes_per_page' => '10',
    'pager_id' => '',
    'offset' => '0',
    'more_link' => 0,
    'feed_icons' => 0,
    'panel_args' => 1,
    'link_to_view' => 0,
    'args' => '',
    'url' => '',
    'display' => 'block_2',
    'context' => array(
      0 => 'argument_term_1.name',
    ),
    'override_title' => 0,
    'override_title_text' => '',
  );
  $pane->cache = array();
  $pane->style = array(
    'settings' => NULL,
  );
  $pane->css = array();
  $pane->extras = array();
  $pane->position = 0;
  $display->content['new-3'] = $pane;
  $display->panels['top'][0] = 'new-3';
$display->hide_title = PANELS_TITLE_NONE;
$display->title_pane = '0';
$handler->conf['display'] = $display;
$page->default_handlers[$handler->name] = $handler;