When trying to forward the following message I get the error message
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| Format specifier doesn't match argument type
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when Gnus tries to perform the Gcc after sending. (Sending seems to work.)

This is the backtrace I obtain:
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| Debugger entered--Lisp error: (error "Internal error, tag 1681 status BAD code nil text junk after literal")
|   signal(error ("Internal error, tag 1681 status BAD code nil text junk after literal"))
|   error("Internal error, tag %s status %s code %s text %s" 1681 BAD nil "junk after literal")
|   imap-parse-response()
|   imap-arrival-filter(#<process imap> "fter literal
\n* BAD Invalid tag
\n")
|   accept-process-output(#<process imap> 0 100)
|   imap-wait-for-tag(1681 nil)
|   imap-send-command-wait(("APPEND \"" "spam/reported" "\" " #<buffer  *acc*>))
|   imap-message-append("spam/reported" #<buffer  *acc*> nil nil " *nnimap* FHI")
|   ad-Orig-nnimap-request-accept-article("spam/reported" "FHI" t)
|   nnimap-request-accept-article("spam/reported" "FHI" t)
|   gnus-request-accept-article("nnimap+FHI:spam/reported" "nnimap:FHI" t t)
|   gnus-inews-do-gcc()
|   gnus-agent-possibly-do-gcc()
|   run-hooks(message-sent-hook)
|   message-send(nil)
|   message-send-and-exit()
|   (let ((gnus-uu-digest-headers nil) (gnus-uu-save-in-digest t) (file ...) (message-forward-as-mime t) (message-syntax-checks ...) (mail-parse-charset gnus-newsgroup-charset) (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets) gnus-uu-digest-buffer subject from) (let (...) (gnus-setup-message ... ... ... ... ... ... ...)) (setq gnus-uu-digest-from-subject nil) (goto-char (point-min)) (when (re-search-forward "^Subject: ") (delete-region ... ...) (insert "ham/spam report")) (goto-char (point-min)) (when (re-search-forward "^From:") (delete-region ... ...) (insert " jochen@fhi-berlin.mpg.de")) (goto-char (point-min)) (when (re-search-forward "^Reply-To:" ... t) (delete-region ... ...) (insert " jochen-+It19tn3Rl9sbm7dSapR3bNAH6kLmebB@public.gmane.org")) (goto-char (point-min)) (when (re-search-forward "^To:") (delete-region ... ...) (insert " " to-address)) (goto-char (point-min)) (when (re-search-forward "^Gcc:" ... t) (delete-region ... ...) (insert "Gcc: nnimap+FHI:spam/reported")) (when (message-goto-signature) (delete-region ... ...)) (message-send-and-exit) (delete-file file))
|   jk/ham-spam-report("spam-+It19tn3Rl9sbm7dSapR3bNAH6kLmebB@public.gmane.org")
|   jk/spam-report()
|   call-interactively(jk/spam-report)
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Software versions used:
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| GNU Emacs 22.0.50.21 (i686-pc-linux-gnu, GTK+ Version 2.4.14)
| No Gnus v0.4
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Greetings,
Jochen
-- 
Einigkeit und Recht und Freiheit                http://www.Jochen-Kuepper.de
    Liberté, Égalité, Fraternité                GnuPG key: CC1B0B4D
        (Part 3 you find in my messages before fall 2003.)