Fatal error: cannot rename tmp

Hi,
while posting I sometimes receive this error. Need to fix some permissions? Thanks

Warning: rename(/web/htdocs/..../home/wp-content/cache/geodir-gd-booster/cache-5918b5f0e9a10392565227-tmp,/web/htdocs/..../home/wp-content/cache/geodir-gd-booster/cache): Directory not empty in /web/htdocs/..../home/wp-content/plugins/geodir_gd_booster/includes/share.php on line 1528

Fatal error: Uncaught Exception: Unable to delete all files/dirs. Rename failure on tmp directory: <code>/web/htdocs/..../home/wp-content/cache/geodir-gd-booster/cache-5918b5f0e9a10392565227-tmp</code>. in /web/htdocs/..../home/wp-content/plugins/geodir_gd_booster/includes/share.php:1529 Stack trace: #0 /web/htdocs/..../home/wp-content/plugins/geodir_gd_booster/geodir-gd-booster.inc.php(767): geodir_gd_booster\share->delete_all_files_dirs_in('/web/htdocs/www...') #1 /web/htdocs/..../home/wp-content/plugins/geodir_gd_booster/geodir-gd-booster.inc.php(856): geodir_gd_booster\plugin->wipe_cache() #2 /web/htdocs/..../home/wp-content/plugins/geodir_gd_booster/includes/actions.php(81): geodir_gd_booster\plugin->auto_wipe_cache() #3 /web/htdocs/..../home/wp-content/plugins/geodir_gd_booster/includes/actions.php(19): geodir_gd_booster\actions->save_options(Array) #4 /web/htdocs/..../home/wp-content/plugins/geodir_gd_booster/includes/actions.php(194): geodir_gd_boos in /web/htdocs/..../home/wp-content/plugins/geodir_gd_booster/includes/share.php on line 1529