deploying Rails 2.02 app with Cap 2.2 - PID file problems

I'm deploying using the recipes laid out in Agile Development w/
Rails.

My app was deploying fine for about 3 months, now I have problems with
PID files.

I get this error during the deploy:
*** [err :: xx.xxx.xx.xxx]
*** [err :: xx.xxx.xx.xxx] **
*** [err :: xx.xxx.xx.xxx] !!! Exiting with error.  You must stop
mongrel and cl
ear the .pid before I'll attempt a start.
*** [err :: xx.xxx.xx.xxx]
*** [err :: xx.xxx.xx.xxx] ** Ruby version is not up-to-date; loading
cgi_multip
art_eof_fix
*** [err :: xx.xxx.xx.xxx] ** !!! PID file tmp/pids/mongrel.8001.pid
already exi
sts.  Mongrel could be running already.  Check your log/mongrel.
8001.log for err
ors.
*** [err :: xx.xxx.xx.xxx] ** !!! Exiting with error.  You must stop
mongrel and
 clear the .pid before I'll attempt a start.
 ** [out :: xx.xxx.xx.xxx] stopping port 8000
 ** [out :: xx.xxx.xx.xxx] stopping port 8001
 ** [out :: xx.xxx.xx.xxx] starting port 8000
 ** [out :: xx.xxx.xx.xxx]
 ** [out :: xx.xxx.xx.xxx] starting port 8001