Error message writes: "is not included in the list". What does it mean? How to edit this movie?

It actually says "status is not included in the list". Choose one of the movie status' from the drop down list and hit save. You will fix this validation error.

Please help, I do not want my adult movies look like child stories on the movie player!

Adult movies are marked as adult in the primary facts page. This is the website and API standard way of filtering adult movies. By default search does not include these and has to be enabled explicitly in either your account options or by the developer of whatever software you are using on the API.

Thanks for the help, the suggestion worked!

I rephrase the second question: There are adult movies, the most of them has an empty field "genre". There are very few ones that has any genres set, but they are usually "erotic". Why am I not able to set the same genre "erotic" for all the adult movies? Without that all adult movies are listed in the "other" genre next to all irrelevant titles. Why is "erotic" selectable for a few movies, but not for movies I just added?

I don't think erotic is in the list of valid genres at the moment. This is most likely an oversight as I haven't heard anything about this until now.

I have an open thread about some proposed genre changes that you can comment on if you'd like: https://www.themoviedb.org/talk/51b5fe1a760ee359996a0e62

Cheers.