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Debugger entered--Lisp error: (void-function org-file-name-concat)
  org-file-name-concat("~/.emacs.d/" "org-persist")
  #f(compiled-function () #<bytecode 0x15921f3e15e1>)()
  funcall(#f(compiled-function () #<bytecode 0x15921f3e15e1>))
  eval((funcall #'#f(compiled-function () #<bytecode 0x15921f3e15e1>)))
  custom-initialize-reset(org-persist-directory (funcall #'#f(compiled-function () #<bytecode 0x15921f3e15e1>)))
  custom-declare-variable(org-persist-directory (funcall #'#f(compiled-function () #<bytecode 0x15921f3e15e1>)) "Directory where the data is stored." :group org-persist :type directory)
  byte-code("\300\301!\210\300\302!\210\300\303\304\305#\210\306\307\304\310\311\312\313\314&\7\210\315\316\317\320\321DD\322\313\307\323\324&\7\207" [require org-compat org-id xdg nil t custom-declare-group org-persist "Persistent cache for Org mode." :tag "Org persist" :group org custom-declare-variable org-persist-directory funcall function #f(compiled-function () #<bytecode 0x15921f3e15e1>) "Directory where the data is stored." :type directory] 8)
  require(org-persist)
  byte-code("\300\301!\210\300\302!\210\300\303!\210\300\304!\210\300\305!\210\300\306!\210\300\307!\210\300\310!\210\300\311!\210\300\312!\210\300\313!\210\300\314!\207" [require avl-tree ring cl-lib ol org org-persist org-compat org-entities org-footnote org-list org-macs org-table] 2)
  require(org-element)
  org-macro-initialize-templates()
  org-mode()
  #f(compiled-function (file) #<bytecode 0x15921efe26fd>)("~/.emacs.d/elfeed.org")
  #f(compiled-function (it) #<bytecode 0x15921f3e024d>)("~/.emacs.d/elfeed.org")
  mapcar(#f(compiled-function (it) #<bytecode 0x15921f3e024d>) ("~/.emacs.d/elfeed.org"))
  -mapcat(#f(compiled-function (file) #<bytecode 0x15921efe26fd>) ("~/.emacs.d/elfeed.org"))
  rmh-elfeed-org-import-headlines-from-files(("~/.emacs.d/elfeed.org") "elfeed")
  rmh-elfeed-org-process(("~/.emacs.d/elfeed.org") "elfeed")
  ad-Advice-elfeed(#f(compiled-function () (interactive nil) #<bytecode 0x15921f194531>))
  apply(ad-Advice-elfeed #f(compiled-function () (interactive nil) #<bytecode 0x15921f194531>) nil)
  elfeed()
  funcall-interactively(elfeed)
  call-interactively(elfeed nil nil)
  command-execute(elfeed)