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From: Michael Heerdegen <michael_heerdegen@web.de>
Newsgroups: gmane.emacs.help
Subject: Re: Tab completion doesn't work.
Date: Tue, 16 May 2023 03:31:39 +0200
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Hongyi Zhao <hongyi.zhao@gmail.com> writes:

> Debugger entered--Lisp error: (wrong-number-of-arguments (3 . 4) 2)
>   helm-add-action-to-source(helm-bibtex (("P"
> helm-bibtex-open-pdf-external "Open PDF file in external viewer (if
> present)")))

So here is another error in the config you posted (the source argument
is missing in that call).

Michael.