Problem with RefTex

[Boris Hollas]

Hi,

ReTex keeps giving me error messages "wrong-marker-or-type-p, nil"  
whenever I try to add a reference. This is my Reftex-hook, adopted from  
'info rextex':

;--- Reftex ---
(add-hook 'reftex-mode-hook
          (function (lambda ()
              (setq reftex-save-parse-info t
                reftex-use-multiple-selection-buffers t)
              (set 'reftex-label-alist '(
                ("aufgabe" ?a "aufg:" "~\\ref{%s}" nil ("Aufgabe"))
                ("beispiel" ?b "bsp:" "~\\ref{%s}" nil ("Beispiel"))
                ("korollar" ?k "kor:" "~\\ref{%s}" nil ("Korollar"))
                ("lemma" ?m "lem:" "~\\ref{%s}" nil ("Lemma"))
                ("satz" ?z "satz:" "~\\ref{%s}" nil ("Satz"))
                        (nil ?s nil nil nil ("Kapitel" "Kap." "Abschnitt"))
                (nil ?t nil nil nil ("Tabelle"))
                (nil ?f nil nil nil ("Abbildung" "Abb."))
               ))
              (set 'reftex-insert-label-flags '("s" "sftabdekmz"))
)))

I don't want exercises, examples, theorems etc. to appear in the TOC.

Reftex doesn't always report errors, today it works, yesterday it didn't,  
with the same .emacs on Emacs 21.3.

Regards,

Boris