HKUDS/DeepTutor · error · ValueError

Two or more choice options have the same answer ({duplicate!

Error message

Two or more choice options have the same answer ({duplicate!r}), so the learner would be shown identical choices. Retry mastery_quiz with one distinct body per option.

What it means

Error "Two or more choice options have the same answer ({duplicate!r}), so the learner would be shown identical choices. Retry mastery_quiz with one distinct body per option." thrown in HKUDS/DeepTutor.

Source

Thrown at deeptutor/capabilities/mastery/tools.py:191

            raise ValueError(
                f"mastery_quiz.options cannot be used with question_type={question_type!r}; "
                "omit options or use question_type='choice'."
            )
        return question_type, [], expected_answer

    intended_labels = option_label_intent(options)
    if intended_labels is not None and set(intended_labels) != canonical_labels(
        len(intended_labels)
    ):
        raise ValueError(
            f"Choice option labels must run A, B, C… with one option each; got "
            f"{intended_labels}. Retry mastery_quiz with one full body per label."
        )

    choice_options = parse_options(options)
    duplicate = _duplicate_option_body(choice_options)
    if duplicate:
        raise ValueError(
            f"Two or more choice options have the same answer ({duplicate!r}), so the "
            "learner would be shown identical choices. Retry mastery_quiz with one "
            "distinct body per option."
        )
    if not has_option_bodies(choice_options):
        raise ValueError(
            "Choice questions need full option bodies in mastery_quiz.options "
            "(for example ['A: first answer', 'B: second answer']), not only "
            "the labels A/B/C/D. Retry mastery_quiz with the exact option "
            "descriptions you will show through ask_user."
        )
    normalized_bodies = {" ".join(body.split()).casefold() for body in choice_options.values()}
    if len(normalized_bodies) != len(choice_options):
        raise ValueError(
            "Choice option bodies must be unique; retry mastery_quiz with "
            "distinct answer text for every option."
        )
    resolved_expected = resolve_answer(expected_answer, choice_options)

View on GitHub (pinned to 3e82f13042)

When it happens

Trigger: Thrown at deeptutor/capabilities/mastery/tools.py:191 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of HKUDS/DeepTutor@3e82f13042 (2026-08-27). Data as JSON: /api/errors/efbd7ed6f3994c3f. Report an issue: GitHub.