void-function org-babel-get-header

[xuchunyang]

I've just installed your package and try to run

#+BEGIN_SRC applescript
  "Hello World"
#+END_SRC

then Emacs fails, and here is the backtrace

Debugger entered--Lisp error: (void-function org-babel-get-header)
  org-babel-get-header(((:colname-names) (:rowname-names) (:result-params "replace") (:result-type . value) (:results . "replace") (:exports . "code") (:session . "none") (:cache . "no") (:noweb . "no") (:hlines . "no") (:tangle . "no")) :var)
  org-babel-variable-assignments:applescript(((:colname-names) (:rowname-names) (:result-params "replace") (:result-type . value) (:results . "replace") (:exports . "code") (:session . "none") (:cache . "no") (:noweb . "no") (:hlines . "no") (:tangle . "no")))
  org-babel-expand-body:applescript("  \"Hello World\"" ((:colname-names) (:rowname-names) (:result-params "replace") (:result-type . value) (:results . "replace") (:exports . "code") (:session . "none") (:cache . "no") (:noweb . "no") (:hlines . "no") (:tangle . "no")))
  org-babel-execute:applescript("  \"Hello World\"" ((:colname-names) (:rowname-names) (:result-params "replace") (:result-type . value) (:results . "replace") (:exports . "code") (:session . "none") (:cache . "no") (:noweb . "no") (:hlines . "no") (:tangle . "no")))
  org-babel-execute-src-block(nil ("applescript" "  \"Hello World\"" ((:colname-names) (:rowname-names) (:result-params "replace") (:result-type . value) (:results . "replace") (:exports . "code") (:tangle . "no") (:hlines . "no") (:noweb . "no") (:cache . "no") (:session . "none")) "" nil 27 "(ref:%s)"))
  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)

This question might be helpful: https://emacs.stackexchange.com/questions/37692/how-to-fix-symbols-function-definition-is-void-org-babel-get-header

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GNU Emacs 26.2.90 (build 3, x86_64-apple-darwin18.6.0, Carbon Version 158 AppKit 1671.5) of 2019-06-22 Org mode version 9.1.9 (release_9.1.9-65-g5e4542 @ /Users/xcy/src/emacs-mac/lisp/org/)