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From: Karl Kleinpaste <karl@justresearch.com>
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Subject: Re: error while executing gnus-group-expire-all-groups
Date: 07 Aug 1999 09:48:29 -0400
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Maciej Matysiak <phoner@blah.pl> writes:
>  Wrong type argument: number-char-or-marker-p, nil
> any idea why?

Not without a stack trace so as to know what failed.

M-x set-var RET debug-on-error RET t RET
Redo what failed.
Save the resulting trace and quit out of the debugger.
Turn debug-on-error off.
Send a new bug report with trace included.