formail: cannot open

Hi,
 Can somebody explain to me why this message is appearing in the log
file and how to fix it?

thanks,
deena

procmail: Locking "msgid.lock"
procmail: Executing "formail,-D,8192,msgid.cache"
formail: formail: cannot open
procmail: Program failure (1) of "formail"
procmail: Assigning "LASTFOLDER=formail -D 8192 msgid.cache"
procmail: Unlocking "msgid.lock"