X_ACTION_ERRORS_INVALID
Means
an errors: list names a code that cannot be declared there
Typical cause
an action or query lists a code in errors: that is not X_SCREAMING_SNAKE, has no registered 4xx status, or is listed twice
Fix
declare the code with defineError({ code, title, status, cause, fix }) first (a 4xx status), then list it once; x errors explain <CODE> --json