For citar support/bugs, you should report on the github issue tracker. But my guess: you need to install citar-embark, as a while ago, we moved the embark-related functionality into a separate package. If it's been a few months since you've updated, that would likely explain it.
On Tue, Oct 25, 2022 at 4:23 PM Henrik Frisk <fris...@gmail.com> wrote: > > Hi, > > After updating a bunch of packages I'm getting this error message when I try > to open an associated file via a reference: > > [cite:@key] > > Before it was working fine via emark either by clicking on the reference or > by running embark-act on it. Now I get this instead: > > citar--library-file-action: Symbol’s function definition is void: open > > Any suggestions? > > /Henrik >