The value must be of the correct primitive type

Summary

when article is added, the user gets a "Value must be a valid primitive type" error.
the article cannot be saved.

In the original, the error looked like this:
"Значение должно быть верного примитивного типа"
Google translated it into the following text: "The value must be of the correct primitive type"

Steps to reproduce

update plugin from r4 version to 1.0, add and save article.

Proposed solution

TBD.