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To: ding@gnus.org
From: Eric Abrahamsen <eric@ericabrahamsen.net>
Subject: Re: nnvirtual counts messages but gives an error
Date: Wed, 04 May 2022 10:10:42 -0700
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Erik Colson <eco@ecocode.net> writes:

> Hi,
>
> I defined a nnvirtual group and when I refresh the count in the group
> list, the count is correct.  So I guess my group definition is correct
> too.
> For the record it is `(nnvirtual "Inbox")`
>
> When I hit enter to view the articles I get following error
>
>   `gnus-cache-articles-in-group: Wrong type argument: hash-table-p, nil`
>
> Why did I do incorrectly?

Can you set `toggle-debug-on-error' to t, trigger the error again,
and post the backtrace here?

Also, if you have a new enough Emacs, the nnselect backend is probably a
better choice for producing this "virtual" type behavior.