I am having a problem and getting a wrong-type-argument error when trying to run `org-beamer-export-to-pdf' on the attached file `debug.org' (see backtrace below). The problem also occurs when running `org-latex-export-to-pdf'. 

The bug can be reproduced using `emacs -Q' with the configuration provided in `simple-config.el'.

Note that the problem can be solved by commenting out the lines:
    (org-babel-do-load-languages
     'org-babel-load-languages
     '((R . t)
       (emacs-lisp . t)
       (latex . t)))

yet doing this then makes it not possible to run C-c C-c on the R src block (without those lines you get an error about not being able to find ESS).

Am I just setting up org-babel incorrectly or is this a bug?

Best,
Justin 


Backtrace:

Debugger entered--Lisp error: (wrong-type-argument number-or-marker-p nil)
  jit-lock--run-functions(1218 1284)
  jit-lock-fontify-now(1218 #<marker at 1284 in L4-6_CoDA.org<2>>)
  #<subr font-lock-ensure>(1218 #<marker at 1284 in L4-6_CoDA.org<2>>)
  polymode-inhibit-during-initialization(#<subr font-lock-ensure> 1218 #<marker at 1284 in L4-6_CoDA.org<2>>)
  apply(polymode-inhibit-during-initialization #<subr font-lock-ensure> (1218 #<marker at 1284 in L4-6_CoDA.org<2>>))
  font-lock-ensure(1218 #<marker at 1284 in L4-6_CoDA.org<2>>)
  org-table-align()
  org-babel-insert-result(((0.333333333333333) (0.333333333333333) (0.333333333333333)) ("value" "replace") ("R" "w1 <- c(1, 1, 1) \nw2 <- c(1, 1, 5) \n\nx1 <- w1/sum(..." ((:colname-names) (:rowname-names) (:result-params "value" "replace") (:result-type . value) (:results . "value replace") (:exports . "both") (:cache . "no") (:hlines . "no") (:noweb . "no") (:session . "*R*") (:tangle . "no")) "" nil 1072 "(ref:%s)") nil "R" (0 0 257283 648000))
  org-babel-execute-src-block(nil ("R" "w1 <- c(1, 1, 1) \nw2 <- c(1, 1, 5) \n\nx1 <- w1/sum(..." ((:colname-names) (:rowname-names) (:result-params "replace" "value") (:result-type . value) (:results . "replace value") (:exports . "both") (:tangle . "no") (:session . "*R*") (:noweb . "no") (:hlines . "no") (:cache . "no")) "" nil 1072 "(ref:%s)"))
  org-babel-exp-results(("R" "w1 <- c(1, 1, 1) \nw2 <- c(1, 1, 5) \n\nx1 <- w1/sum(..." ((:cache . "no") (:colname-names) (:exports . "both") (:hlines . "no") (:noweb . "no") (:result-params "replace" "value") (:result-type . value) (:results . "replace value") (:rowname-names) (:session . "*R*") (:tangle . "no")) "" nil 1072 "(ref:%s)") block nil "2da1507400b1866895fab4840062db146ee4de1e")
  org-babel-exp-do-export(("R" "w1 <- c(1, 1, 1) \nw2 <- c(1, 1, 5) \n\nx1 <- w1/sum(..." ((:cache . "no") (:colname-names) (:exports . "both") (:hlines . "no") (:noweb . "no") (:result-params "replace" "value") (:result-type . value) (:results . "replace value") (:rowname-names) (:session . "*R*") (:tangle . "no")) "" nil 1072 "(ref:%s)") block "2da1507400b1866895fab4840062db146ee4de1e")
  org-babel-exp-src-block((src-block (:language "R" :switches nil :parameters ":exports both :results value :session \"*R*\"" :begin 1072 :end 1207 :number-lines nil :preserve-indent nil :retain-labels t :use-labels t :label-fmt nil :value "  w1 <- c(1, 1, 1) \n  w2 <- c(1, 1, 5) \n\n  x1 <- w..." :post-blank 1 :post-affiliated 1072 :mode planning :granularity element :cached nil :parent (section (:begin 1072 :end 1207 :contents-begin 1072 :contents-end 1206 :robust-begin 1072 :robust-end 1204 :post-blank 1 :post-affiliated 1072 :mode section :granularity element :cached nil :parent (headline (:raw-value "Spurious Conclusions" :begin 1047 :end 1285 :pre-blank 1 :contents-begin 1072 :contents-end 1284 :robust-begin 1074 :robust-end 1282 :level 2 :priority nil :tags nil :todo-keyword nil :todo-type nil :post-blank 1 :footnote-section-p nil :archivedp nil :commentedp nil :post-affiliated 1047 :title (...) :parent (org-data ...) :cached t :org-element--cache-sync-key (0 . 1047))) :org-element--cache-sync-key (0 . 1071))) :org-element--cache-sync-key (0 . 1072))))
  org-babel-exp-process-buffer()
  org-export-as(beamer nil nil nil (:output-file "L4-6_CoDA.tex"))
  org-export-to-file(beamer "L4-6_CoDA.tex" nil nil nil nil nil org-latex-compile)
  org-beamer-export-to-pdf()
  funcall-interactively(org-beamer-export-to-pdf)
  command-execute(org-beamer-export-to-pdf)