Couldn't find any pid ... matching 'dispatch.[0-9]

Couldn't find any pid ... matching 'dispatch.[0-9]

我用的是ubuntu7.10,script/server启动lighttpd服务,启动一起正常,日志里也没什么错误提示。
我结束服务的时候,出现下面的提示:
Couldn't find any pid file in '/u/apps/project/current/tmp/pids'
matching 'dispatch.[0-9]*.pid'
(also looked for process matching "/u/apps/project/current/public/dispatch.fcgi")
是什么问题?
我的ruby 1.8.6
php?name=rails" onclick="tagshow(event)" class="t_tag">rails 2.0.2
应该是和lighttpd分配线程有关,可能没关闭成功或者什么的。