I got the following error when running build-toc and have no idea what any of it means. What's going on?
Traceback (most recent call last):
File "/home/robby/.local/bin/se", line 8, in <module>
sys.exit(main())
File "/home/robby/.local/pipx/venvs/standardebooks/lib/python3.6/site-packages/se/main.py", line 81, in main
sys.exit(getattr(module, command_function)(args.plain_output))
File "/home/robby/.local/pipx/venvs/standardebooks/lib/python3.6/site-packages/se/commands/build_toc.py", line 39, in build_toc
toc = se_epub.generate_toc()
File "/home/robby/.local/pipx/venvs/standardebooks/lib/python3.6/site-packages/se/se_epub.py", line 1279, in generate_toc
toc_xhtml = generate_toc(self)
File "/home/robby/.local/pipx/venvs/standardebooks/lib/python3.6/site-packages/se/se_epub_generate_toc.py", line 768, in generate_toc
landmarks, toc_list = process_all_content(self, self.spine_file_paths)
File "/home/robby/.local/pipx/venvs/standardebooks/lib/python3.6/site-packages/se/se_epub_generate_toc.py", line 735, in process_all_content
process_headings(dom,
textf.name, toc_list, single_file, single_file_without_headers)
File "/home/robby/.local/pipx/venvs/standardebooks/lib/python3.6/site-packages/se/se_epub_generate_toc.py", line 423, in process_headings
special_item.level = get_level(content_item[0], toc_list)
IndexError: list index out of range