From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nick Dokos <ndokos@gmail.com>
Subject: Re: Issue with internal links
Date: Thu, 08 Aug 2019 16:54:31 -0400
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"Doyley, Marvin M." <m.doyley@rochester.edu> writes:

>
> * Testing
> * One
> * Two
>    [[*Testing]].   (I also tried [[Testing]] and I got the same error)
>
> Debugger entered--Lisp error: (void-function org-pass-link-to-system)
>   org-pass-link-to-system("*Testing")
>   run-hook-with-args-until-success(org-pass-link-to-system "*Testing")
>   (if (run-hook-with-args-until-success 'org-open-link-functions path) ....

org-pass-link-to-system is not a function defined by org mode, AFAICT.
The fact that it's the value of the org-open-link-functions hook reinforces
my belief that at some point in the past, you had defined this function
somewhere and you had included it in the hook; perhaps you lost the function
after an upgrade or a disk failure or ... who knows?

The value of org-open-link-functions is nil in my case, so I'd recommend
you try setting it to that:

     (setq org-open-link-functions nil)

and try following the link. If that works to your satisfaction, then
find the place in your init file or customizations file where
org-pass-link-to-system is added to org-open-link-functions and get
rid of it. Then restart emacs.

HTH.
-- 
Nick

"There are only two hard problems in computer science: cache
invalidation, naming things, and off-by-one errors." -Martin Fowler