[Regression] Packaging error with example plugin installed

Hi ,

Thank you for your answer.

1, If I understand correctly, plugins can not be used inside a blueprint project, as it is not a code project. Is it only a limitation for in-editor method of plugin creation? What are needed for creating a plugin for blueprint projects with any other methods?

2, the version I tried was 4.10.4, which has the “New Plugin” button. So I guess it was introduced already?