def METHOD_NAME(self):
    """Load the content for a section.
    Raises:
        MissingRequiredFieldError: When a config (yaml) file is missing a required
            field.
    """
    chapter_sections_structure = self.load_yaml_file(self.structure_file_path)
    next_section_number = 1
    for (section_slug, section_structure) in chapter_sections_structure.items():
        if section_structure is None:
            raise MissingRequiredFieldError(
                self.structure_file_path,
                ["section-number"],
                "ChapterSection"
            )
        section_number = section_structure.get("section-number", None)
        if section_number is None:
            raise MissingRequiredFieldError(
                self.structure_file_path,
                ["section-number"],
                "ChapterSection"
            )
        if isinstance(section_number, int) is False:
            raise InvalidYAMLValueError(
                self.structure_file_path,
                "section-number - value '{}' is invalid".format(section_number),
                "section-number must be an integer value."
            )
        if section_number != next_section_number:
            raise InvalidYAMLValueError(
                self.structure_file_path,
                "section-number - value '{}' is invalid".format(section_number),
                "section-numbers must be in sequential order. The next expected number was '{}'."
                    .format(next_section_number)
            )
        next_section_number += 1
        chapter_section_translations = self.get_blank_translation_dictionary()
        content_filename = "{}.md".format(section_slug)
        content_translations = self.get_markdown_translations(content_filename)
        for language, content in content_translations.items():
            chapter_section_translations[language]["content"] = content.html_string
            chapter_section_translations[language]["name"] = content.title
        chapter_section, created = self.chapter.chapter_sections.update_or_create(
            number=section_number,
            defaults={
                'slug': section_slug,
                'languages': list(content_translations.keys()),
            }
        )
        self.populate_translations(chapter_section, chapter_section_translations)
        self.mark_translation_availability(chapter_section, required_fields=["name", "content"])
        chapter_section.save()
        if created:
            term = 'Created'
        else:
            term = 'Updated'
        self.log(f'{term} chapter section: {chapter_section.name}', 1)
        check_interactives(
            content_translations[get_default_language()].required_files["interactives"],
            self.structure_file_path,
            self.chapter,
        )
        # Save chapter section headings
        self.factory.create_chapter_section_heading_loader(
            chapter_section,
            content_translations,
            base_path=self.base_path,
            structure_filename=self.structure_file_path,
        ).METHOD_NAME()
    self.chapter.chapter_sections.filter(number__gte=next_section_number).delete()