なぜ、再構築しない・・・

gistfile1.pl

      if ($entry) {
        my $releasedate = 'field.dolreleasedate';
        if ($entry->authored_on < $entry->$releasedate) {
          $entry->authored_on($entry->$releasedate);
          $entry->save
            or
            die $app->trans_error( "Error saving : [_1]", $entry->errstr );
          MT::Util::start_background_task(
            sub {
              $app->rebuild_entry(
                Entry             => $entry,
                BuildDependencies => 1
                )
                or
                return $app->_response(Error => $app->translate("Rebuild failed: [_1]", $app->errstr));
            }
          );
        }