[support] unknown problem after doing drush up

Dear All, Just tried to update core thru drush AND GET THIS: (where's that bottle of single malt?).

tonymacc@tony-mac.com [~/public_html/drupal]# drush dl entity entity_token require_once(/home3/tonymacc/public_html/drupal/modules/entity/includes/entity.controller.inc):[warning] failed to open stream: No such file or directory bootstrap.inc:3088 Drush command terminated abnormally due to an unrecoverable error. [error] Error: require_once(): Failed opening required '/home3/tonymacc/public_html/drupal/modules/entity/includes/entity.controller.inc' (include_path='.:/usr/lib64/php:/usr/lib/php:/usr/share/pear') in /home3/tonymacc/public_html/drupal/includes/bootstrap.inc, line 3088

Any ideas welcome of course. Thanks