File mode specification error: (void-variable keymap)

[jthaman]

I'm getting this error from poly-R when I try to load it. I'm using the below configuration, which I slightly abbreviated by removing some custom functions.

(use-package polymode
  :defer t
  :ensure t)

(use-package poly-R
  :defer t
  :after polymode
  :ensure t)

(use-package poly-markdown
  :defer t
  :after polymode
  :mode
  ("\\.Rmd\\'" . poly-markdown+R-mode)
  :ensure t)

[jthaman]

I can't make heads or tails of this, but here is the traceback from (require 'poly-R)

Debugger entered--Lisp error: (void-variable keymap)
  byte-code("\304\305!\210\306\307\310\311\"\211\205\17\0\211J\312\303!\210\313\314\10!\203\36\0\10\202Z\0\314\10!\203(\0\315\202P\0\316\11J!\203A\0\317\10\11..." [keymap parent polymode-minor-mode-map poly-noweb-mode-map make-variable-buffer-local poly-noweb-mode (("<" . poly-noweb-electric-<)) pm--config-name poly-latex-root-polymode must-exist makunbound (lambda (def-tmp-var) (defvar poly-noweb-mode-map def-tmp-var "Keymap for poly-noweb-mode.")) keymapp nil eieio-object-p pm--get-keylist\.keymap-from-parent append derived-mode-map-name eieio-oref -minor-mode easy-mmode-define-keymap :inherit poly-noweb-polymode (lambda (def-tmp-var) (defvar poly-noweb-polymode def-tmp-var "Configuration object for `poly-noweb-mode' polymod...")) clone :name "poly-noweb-polymode" :exporters (poly-noweb-latexmk-exporter poly-noweb-pdflatex-exporter poly-noweb-lualatex-exporter poly-noweb-xelatex-exporter) :innermodes (poly-noweb-auto-innermode poly-noweb-inline-innermode) :hostmode poly-noweb-latex-hostmode pm-polymode defalias #f(compiled-function (&optional arg) "Polymode for noweb.\n\n\\{poly-noweb-mode-map}" (interactive nil) #<bytecode -0xfd5dac76cfa44e>) add-minor-mode " PM"] 16)
  require(poly-noweb)
  eval-buffer(#<buffer  *load*> nil "/home/john/.emacs.d/elpa/poly-R-20210210.1053/poly..." nil t)  ; Reading at buffer position 1923
  load-with-code-conversion("/home/john/.emacs.d/elpa/poly-R-20210210.1053/poly..." "/home/john/.emacs.d/elpa/poly-R-20210210.1053/poly..." nil t)
  require(poly-R)
  eval((require 'poly-R) t)
  eval-expression((require 'poly-R) nil nil 127)
  funcall-interactively(eval-expression (require 'poly-R) nil nil 127)
  call-interactively(eval-expression nil nil)
  command-execute(eval-expression)