Warnings when installing from MELPA

[Ypot]

I receive these messages:

In org-noter-pdftools-create-skeleton:
org-noter-pdftools.el:543:41:Warning: reference to free variable
    `org-noter-pdftool-link-generator'

In org-noter-pdftools-embed-org-note-to-pdf:
org-noter-pdftools.el:640:24:Warning: assignment to free variable `kr'
org-noter-pdftools.el:645:22:Warning: reference to free variable `kr'