[rtd-command-info] start-time: 2018-06-15T18:07:42.408524, end-time: 2018-06-15T18:07:43.230603, duration: 0, exit-code: 1
python /home/docs/checkouts/readthedocs.org/user_builds/mcforge/envs/latest/bin/mkdocs build --clean --site-dir _build/html --config-file /home/docs/checkouts/readthedocs.org/user_builds/mcforge/checkouts/latest/mkdocs.yml --theme readthedocs
WARNING -  Config value: 'theme_dir'. Warning: The configuration option {0} has been deprecated and will be removed in a future release of MkDocs.
INFO    -  Cleaning site directory
INFO    -  Building documentation to directory: /home/docs/checkouts/readthedocs.org/user_builds/mcforge/checkouts/latest/_build/html
ERROR   -  Error building page index.md
Traceback (most recent call last):
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/envs/latest/bin/mkdocs", line 11, in <module>
    sys.exit(cli())
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/envs/latest/local/lib/python2.7/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/envs/latest/local/lib/python2.7/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/envs/latest/local/lib/python2.7/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/envs/latest/local/lib/python2.7/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/envs/latest/local/lib/python2.7/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/envs/latest/local/lib/python2.7/site-packages/mkdocs/__main__.py", line 156, in build_command
    ), dirty=not clean)
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/envs/latest/local/lib/python2.7/site-packages/mkdocs/commands/build.py", line 282, in build
    build_pages(config, dirty=dirty)
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/envs/latest/local/lib/python2.7/site-packages/mkdocs/commands/build.py", line 242, in build_pages
    _build_page(page, config, site_navigation, env)
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/envs/latest/local/lib/python2.7/site-packages/mkdocs/commands/build.py", line 158, in _build_page
    output_content = template.render(context)
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/envs/latest/local/lib/python2.7/site-packages/jinja2/environment.py", line 1008, in render
    return self.environment.handle_exception(exc_info, True)
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/envs/latest/local/lib/python2.7/site-packages/jinja2/environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/checkouts/latest/forge_theme/main.html", line 1, in top-level template code
    {% extends "base.html" %}
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/checkouts/latest/forge_theme/base.html", line 87, in top-level template code
    {% include "nav.html" %}
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/checkouts/latest/forge_theme/nav.html", line 4, in top-level template code
    <a href="{{ (toc|first).url }}" class="elem-text">{{ nav_item.title }}</a>
  File "/home/docs/checkouts/readthedocs.org/user_builds/mcforge/envs/latest/local/lib/python2.7/site-packages/jinja2/environment.py", line 430, in getattr
    return getattr(obj, attribute)
jinja2.exceptions.UndefinedError: No first item, sequence was empty.