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Helm error "invalid function: add-function" for Emacs 24.4 on develop branch #1624

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drmikehenry opened this issue May 17, 2015 · 5 comments
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Helm error "invalid function: add-function" for Emacs 24.4 on develop branch #1624

drmikehenry opened this issue May 17, 2015 · 5 comments
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Documentation ✏ Emacs 24.3 Question

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@drmikehenry
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Hi,

I tried to upgrade Emacs from 24.3 to 24.5, at which point when I launch Helm I get the following error:
Error (use-package): helm :config: Invalid function: add-function
In addition, the mapping of TAB in helm windows reverts back to toggling the action menu.

The same thing occurs in Emacs 24.4. New in Emacs 24.4 is the package nadvice.el which provides add-function and remove-function, which may have something to do with this problem. I've downgraded back to Emacs 24.3 as a work-around.

Michael Henry
@syl20bnr
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When you upgrade the version of Emacs, be sure to wipeout the ~/.emacs.d/elpa directory and relaunch Emacs in order to reinstall all the packages with the new version.

@drmikehenry
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Thanks! That fixed the problem, both for Emacs 24.4 and 24.5. I hadn't realized that the Emacs version would influence the contents of ~/.emacs.d/elpa. Is this documented somewhere that I missed? I'm just getting started with Spacemacs, so I may well have overlooked this piece of advice. It also might be helpful to mention this trick in the installation notes, perhaps near this section: https://github.com/syl20bnr/spacemacs#emacs-version

Thanks again for the help; this answers my question completely.

@TheBB
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TheBB commented May 18, 2015

The packages are all bytecode compiled upon installation, so it's not so far fetched that they are bound to a particular version of Emacs after that. I haven't seen it stated explicitly, however.

@TheBB TheBB closed this as completed Aug 27, 2015
@cies
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cies commented Sep 13, 2015

Made the same mistake. Google'ing for the error already points here :)

@justbur justbur mentioned this issue Oct 15, 2015
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@pscollins
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For future people who stumble on this from Google: it's enough to go into your ~/emacs.d and run

find -name "*.elc" -delete

After that, I was able to run emacs fine.

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@cies @TheBB @drmikehenry @syl20bnr @pscollins