cd rust-by-practice && mdbook serve en/ this command is error for me

INFO Book building has started INFO Running the html backend ERROR Failed to deserialize output.html Caused by: unknown field editor, expected one of editable, copyable, copy-js, line-numbers, runnable in playpen

WARN unclosed HTML tag <u8> found in compound-types/string.md while exiting Paragraph HTML tags must be closed before exiting a markdown element. INFO HTML book written to C:\Users\sedat\Desktop\Rust_Practice\rust-by-practice\en/book ERROR Failed to deserialize output.html Caused by: unknown field editor, expected one of editable, copyable, copy-js, line-numbers, runnable in playpen

INFO Serving on: http://localhost:3000 INFO Watching for changes... ERROR Failed to deserialize output.html Caused by: unknown field editor, expected one of editable, copyable, copy-js, line-numbers, runnable in playpen

ERROR Failed to deserialize output.html Caused by: unknown field editor, expected one of editable, copyable, copy-js, line-numbers, runnable in playpen

error message is here ı look at the book.toml is everthing right but ı have error again