Unable to add notes

[philohistoria]

I was upgrading to Emacs 26 to 28. It also upgrades my org-ref from version 20191023.117 to org-ref-20220509.1414
Then my note taking stopped working

I can use org-ref-cite-insert-helm to insert citations like cite:&XXX , but when I try to run
org-ref-open-bibtex-notes or org-ref-open-notes-at-point or directly click on the citation, the error debug result is

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
regexp-quote(nil)
bibtex-completion-get-entry1(nil)
bibtex-completion-get-entry(nil)
bibtex-completion-edit-notes-default((nil))
bibtex-completion-edit-notes((nil))
org-ref-open-notes-at-point()
funcall-interactively(org-ref-open-notes-at-point)
call-interactively(org-ref-open-notes-at-point)
(if remapped-cmd (call-interactively remapped-cmd) (call-interactively cmd))
(let ((remapped-cmd (if hydra-look-for-remap (command-remapping cmd) nil))) (if remapped-cmd (call-interactively remapped-cmd) (call-interactively cmd)))
hydra--call-interactively-remap-maybe(org-ref-open-notes-at-point)
org-ref-citation-hydra/org-ref-open-notes-at-point-and-exit()
funcall-interactively(org-ref-citation-hydra/org-ref-open-notes-at-point-and-exit)
call-interactively(org-ref-citation-hydra/org-ref-open-notes-at-point-and-exit nil nil)
command-execute(org-ref-citation-hydra/org-ref-open-notes-at-point-and-exit)

Does anyone has similar issues? Or could anyone help diagnose these issues? Thanks a lot!

[jkitchin]

The error you show seems to indicate it is not finding a cite link at the point. i,e. org-ref-get-bibtex-key-under-cursor is returning nil. I would start by debugging that function.

notes work for me.