I've attached an ECM and below is my attempt at the backtrace. Let me know if I missed something. * org-at-property-p() * #[0 "\301 \204 \302\303!\210\304\305!\306 \210\307\310 \311#8\204 \302\312 \"\210\313 !\207" [org-columns-current-fmt-compiled org-at-property-p user-error "Not at a property" match-string-no-properties 2 org-columns-get-format-and-top-level 3 assoc-string t "No operator defined for property %s" org-columns-compute] 6 ("/home/kevin/.emacs.d/lib/org/lisp/org.elc" . 550375) nil]() * apply(#[0 "\301 \204 \302\303!\210\304\305!\306 \210\307\310 \311#8\204 \302\312 \"\210\313 !\207" [org-columns-current-fmt-compiled org-at-property-p user-error "Not at a property" match-string-no-properties 2 org-columns-get-format-and-top-level 3 assoc-string t "No operator defined for property %s" org-columns-compute] 6 ("/home/kevin/.emacs.d/lib/org/lisp/org.elc" . 550375) nil] nil) * org-compute-property-at-point() funcall-interactively(org-compute-property-at-point) call-interactively(org-compute-property-at-point) org-property-action() funcall-interactively(org-property-action) call-interactively(org-property-action) org-ctrl-c-ctrl-c(nil) funcall-interactively(org-ctrl-c-ctrl-c nil) call-interactively(org-ctrl-c-ctrl-c nil nil) command-execute(org-ctrl-c-ctrl-c) Thanks, Kevin Foley On Mon, Jun 5, 2017 at 5:00 PM, Nicolas Goaziou wrote: > Hello, > > Kevin Foley writes: > > > I'm getting the error "No operator defined for property header-args" when > > trying to run `org-property-action` on the `header-args` property below: > > > > * outline header > > :PROPERTIES: > > :header-args:bash: :tangle yes > > :END: > > > > I'm able to set the same properties using > > > > #+PROPERTY: header-args:bash :tangle yes > > > > I've tried running `emacs -Q` and get the same error. I'm using > > org-version is 9.0.7 > > I'm not able to reproduce it. Could you post an ECM and a backtrace? > > Regards, > > -- > Nicolas Goaziou >