problem with locking and unlocking: "formail -s procmail"

my .procmail
----------------------
:0:
* ^Subject:.*ACCMAIL Digest
accmail

:0:
* ^Subject:.*HELP-NET Digest
help-net

Why is there a locking problem when I execute "formail -s procmail" on my
folder, although it works?

By the wat, I cannot use "procmail" to reproccess my folder.
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