We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Failed build of docs in CI
```
#!/bin/bash -eo pipefail
cd docs
make html
npm install && touch node_modules
npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@~2.1.2 (node_modules/chokidar/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@2.1.2: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
npm WARN jupyterhub-docs-build@0.8.0 No repository field.

added 216 packages from 514 contributors and audited 325 packages in 4.188s

14 packages are looking for funding
  run `npm fund` for details

found 2 low severity vulnerabilities
  run `npm audit fix` to fix them, or `npm audit` for details
npm run rest-api

> jupyterhub-docs-build@0.8.0 rest-api /home/circleci/project/docs
> bootprint openapi ./rest-api.yml source/_static/rest-api

[
  'source/_static/rest-api/index.html',
  'source/_static/rest-api/main.css',
  'source/_static/rest-api/main.css.map'
]
sphinx-build -b html -d build/doctrees  "-W" source build/html
Running Sphinx v2.4.4
Adding copy buttons to code blocks...
making output directory... done
/home/circleci/.local/lib/python3.6/site-packages/sphinx/util/compat.py:32: RemovedInSphinx30Warning: The config variable "source_parsers" is deprecated. Please update your extension for the parser and remove the setting.
  RemovedInSphinx30Warning)
/home/circleci/.local/lib/python3.6/site-packages/sphinx/util/compat.py:36: RemovedInSphinx30Warning: app.add_source_parser() does not support suffix argument. Use app.add_source_suffix() instead.
  app.add_source_parser(suffix, parser)

Theme error:
no theme named 'pandas_sphinx_theme' found (missing theme.conf?)
Makefile:64: recipe for target 'html' failed
make: *** [html] Error 2
```

FYI @choldgraf @betatim

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `docs/source/conf.py`
Content:
```
1 # -*- coding: utf-8 -*-
2 #
3 import os
4 import shlex
5 import sys
6 
7 # Set paths
8 sys.path.insert(0, os.path.abspath('.'))
9 
10 # -- General configuration ------------------------------------------------
11 
12 # Minimal Sphinx version
13 needs_sphinx = '1.4'
14 
15 # Sphinx extension modules
16 extensions = [
17     'sphinx.ext.autodoc',
18     'sphinx.ext.intersphinx',
19     'sphinx.ext.napoleon',
20     'autodoc_traits',
21     'sphinx_copybutton',
22     'sphinx-jsonschema',
23 ]
24 
25 templates_path = ['_templates']
26 
27 # The master toctree document.
28 master_doc = 'index'
29 
30 # General information about the project.
31 project = u'JupyterHub'
32 copyright = u'2016, Project Jupyter team'
33 author = u'Project Jupyter team'
34 
35 # Autopopulate version
36 from os.path import dirname
37 
38 docs = dirname(dirname(__file__))
39 root = dirname(docs)
40 sys.path.insert(0, root)
41 
42 import jupyterhub
43 
44 # The short X.Y version.
45 version = '%i.%i' % jupyterhub.version_info[:2]
46 # The full version, including alpha/beta/rc tags.
47 release = jupyterhub.__version__
48 
49 language = None
50 exclude_patterns = []
51 pygments_style = 'sphinx'
52 todo_include_todos = False
53 
54 # Set the default role so we can use `foo` instead of ``foo``
55 default_role = 'literal'
56 
57 # -- Source -------------------------------------------------------------
58 
59 import recommonmark
60 from recommonmark.transform import AutoStructify
61 
62 
63 def setup(app):
64     app.add_config_value('recommonmark_config', {'enable_eval_rst': True}, True)
65     app.add_stylesheet('custom.css')
66     app.add_transform(AutoStructify)
67 
68 
69 source_parsers = {'.md': 'recommonmark.parser.CommonMarkParser'}
70 
71 source_suffix = ['.rst', '.md']
72 # source_encoding = 'utf-8-sig'
73 
74 # -- Options for HTML output ----------------------------------------------
75 
76 # The theme to use for HTML and HTML Help pages.
77 html_theme = 'pandas_sphinx_theme'
78 
79 html_logo = '_static/images/logo/logo.png'
80 html_favicon = '_static/images/logo/favicon.ico'
81 
82 # Paths that contain custom static files (such as style sheets)
83 html_static_path = ['_static']
84 
85 htmlhelp_basename = 'JupyterHubdoc'
86 
87 # -- Options for LaTeX output ---------------------------------------------
88 
89 latex_elements = {
90     # 'papersize': 'letterpaper',
91     # 'pointsize': '10pt',
92     # 'preamble': '',
93     # 'figure_align': 'htbp',
94 }
95 
96 # Grouping the document tree into LaTeX files. List of tuples
97 # (source start file, target name, title,
98 #  author, documentclass [howto, manual, or own class]).
99 latex_documents = [
100     (
101         master_doc,
102         'JupyterHub.tex',
103         u'JupyterHub Documentation',
104         u'Project Jupyter team',
105         'manual',
106     )
107 ]
108 
109 # latex_logo = None
110 # latex_use_parts = False
111 # latex_show_pagerefs = False
112 # latex_show_urls = False
113 # latex_appendices = []
114 # latex_domain_indices = True
115 
116 
117 # -- manual page output -------------------------------------------------
118 
119 # One entry per manual page. List of tuples
120 # (source start file, name, description, authors, manual section).
121 man_pages = [(master_doc, 'jupyterhub', u'JupyterHub Documentation', [author], 1)]
122 
123 # man_show_urls = False
124 
125 
126 # -- Texinfo output -----------------------------------------------------
127 
128 # Grouping the document tree into Texinfo files. List of tuples
129 # (source start file, target name, title, author,
130 #  dir menu entry, description, category)
131 texinfo_documents = [
132     (
133         master_doc,
134         'JupyterHub',
135         u'JupyterHub Documentation',
136         author,
137         'JupyterHub',
138         'One line description of project.',
139         'Miscellaneous',
140     )
141 ]
142 
143 # texinfo_appendices = []
144 # texinfo_domain_indices = True
145 # texinfo_show_urls = 'footnote'
146 # texinfo_no_detailmenu = False
147 
148 
149 # -- Epub output --------------------------------------------------------
150 
151 # Bibliographic Dublin Core info.
152 epub_title = project
153 epub_author = author
154 epub_publisher = author
155 epub_copyright = copyright
156 
157 # A list of files that should not be packed into the epub file.
158 epub_exclude_files = ['search.html']
159 
160 # -- Intersphinx ----------------------------------------------------------
161 
162 intersphinx_mapping = {'https://docs.python.org/3/': None}
163 
164 # -- Read The Docs --------------------------------------------------------
165 
166 on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
167 if on_rtd:
168     # readthedocs.org uses their theme by default, so no need to specify it
169     # build rest-api, since RTD doesn't run make
170     from subprocess import check_call as sh
171 
172     sh(['make', 'rest-api'], cwd=docs)
173 
174 # -- Spell checking -------------------------------------------------------
175 
176 try:
177     import sphinxcontrib.spelling
178 except ImportError:
179     pass
180 else:
181     extensions.append("sphinxcontrib.spelling")
182 
183 spelling_word_list_filename = 'spelling_wordlist.txt'
184
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/docs/source/conf.py b/docs/source/conf.py
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -74,7 +74,7 @@
 # -- Options for HTML output ----------------------------------------------
 
 # The theme to use for HTML and HTML Help pages.
-html_theme = 'pandas_sphinx_theme'
+html_theme = 'pydata_sphinx_theme'
 
 html_logo = '_static/images/logo/logo.png'
 html_favicon = '_static/images/logo/favicon.ico'

{"golden_diff": "diff --git a/docs/source/conf.py b/docs/source/conf.py\n--- a/docs/source/conf.py\n+++ b/docs/source/conf.py\n@@ -74,7 +74,7 @@\n # -- Options for HTML output ----------------------------------------------\n \n # The theme to use for HTML and HTML Help pages.\n-html_theme = 'pandas_sphinx_theme'\n+html_theme = 'pydata_sphinx_theme'\n \n html_logo = '_static/images/logo/logo.png'\n html_favicon = '_static/images/logo/favicon.ico'\n", "issue": "Failed build of docs in CI\n```\r\n#!/bin/bash -eo pipefail\r\ncd docs\r\nmake html\r\nnpm install && touch node_modules\r\nnpm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142\r\nnpm notice created a lockfile as package-lock.json. You should commit this file.\r\nnpm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@~2.1.2 (node_modules/chokidar/node_modules/fsevents):\r\nnpm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@2.1.2: wanted {\"os\":\"darwin\",\"arch\":\"any\"} (current: {\"os\":\"linux\",\"arch\":\"x64\"})\r\nnpm WARN jupyterhub-docs-build@0.8.0 No repository field.\r\n\r\nadded 216 packages from 514 contributors and audited 325 packages in 4.188s\r\n\r\n14 packages are looking for funding\r\n  run `npm fund` for details\r\n\r\nfound 2 low severity vulnerabilities\r\n  run `npm audit fix` to fix them, or `npm audit` for details\r\nnpm run rest-api\r\n\r\n> jupyterhub-docs-build@0.8.0 rest-api /home/circleci/project/docs\r\n> bootprint openapi ./rest-api.yml source/_static/rest-api\r\n\r\n[\r\n  'source/_static/rest-api/index.html',\r\n  'source/_static/rest-api/main.css',\r\n  'source/_static/rest-api/main.css.map'\r\n]\r\nsphinx-build -b html -d build/doctrees  \"-W\" source build/html\r\nRunning Sphinx v2.4.4\r\nAdding copy buttons to code blocks...\r\nmaking output directory... done\r\n/home/circleci/.local/lib/python3.6/site-packages/sphinx/util/compat.py:32: RemovedInSphinx30Warning: The config variable \"source_parsers\" is deprecated. Please update your extension for the parser and remove the setting.\r\n  RemovedInSphinx30Warning)\r\n/home/circleci/.local/lib/python3.6/site-packages/sphinx/util/compat.py:36: RemovedInSphinx30Warning: app.add_source_parser() does not support suffix argument. Use app.add_source_suffix() instead.\r\n  app.add_source_parser(suffix, parser)\r\n\r\nTheme error:\r\nno theme named 'pandas_sphinx_theme' found (missing theme.conf?)\r\nMakefile:64: recipe for target 'html' failed\r\nmake: *** [html] Error 2\r\n```\r\n\r\nFYI @choldgraf @betatim\n", "before_files": [{"content": "# -*- coding: utf-8 -*-\n#\nimport os\nimport shlex\nimport sys\n\n# Set paths\nsys.path.insert(0, os.path.abspath('.'))\n\n# -- General configuration ------------------------------------------------\n\n# Minimal Sphinx version\nneeds_sphinx = '1.4'\n\n# Sphinx extension modules\nextensions = [\n    'sphinx.ext.autodoc',\n    'sphinx.ext.intersphinx',\n    'sphinx.ext.napoleon',\n    'autodoc_traits',\n    'sphinx_copybutton',\n    'sphinx-jsonschema',\n]\n\ntemplates_path = ['_templates']\n\n# The master toctree document.\nmaster_doc = 'index'\n\n# General information about the project.\nproject = u'JupyterHub'\ncopyright = u'2016, Project Jupyter team'\nauthor = u'Project Jupyter team'\n\n# Autopopulate version\nfrom os.path import dirname\n\ndocs = dirname(dirname(__file__))\nroot = dirname(docs)\nsys.path.insert(0, root)\n\nimport jupyterhub\n\n# The short X.Y version.\nversion = '%i.%i' % jupyterhub.version_info[:2]\n# The full version, including alpha/beta/rc tags.\nrelease = jupyterhub.__version__\n\nlanguage = None\nexclude_patterns = []\npygments_style = 'sphinx'\ntodo_include_todos = False\n\n# Set the default role so we can use `foo` instead of ``foo``\ndefault_role = 'literal'\n\n# -- Source -------------------------------------------------------------\n\nimport recommonmark\nfrom recommonmark.transform import AutoStructify\n\n\ndef setup(app):\n    app.add_config_value('recommonmark_config', {'enable_eval_rst': True}, True)\n    app.add_stylesheet('custom.css')\n    app.add_transform(AutoStructify)\n\n\nsource_parsers = {'.md': 'recommonmark.parser.CommonMarkParser'}\n\nsource_suffix = ['.rst', '.md']\n# source_encoding = 'utf-8-sig'\n\n# -- Options for HTML output ----------------------------------------------\n\n# The theme to use for HTML and HTML Help pages.\nhtml_theme = 'pandas_sphinx_theme'\n\nhtml_logo = '_static/images/logo/logo.png'\nhtml_favicon = '_static/images/logo/favicon.ico'\n\n# Paths that contain custom static files (such as style sheets)\nhtml_static_path = ['_static']\n\nhtmlhelp_basename = 'JupyterHubdoc'\n\n# -- Options for LaTeX output ---------------------------------------------\n\nlatex_elements = {\n    # 'papersize': 'letterpaper',\n    # 'pointsize': '10pt',\n    # 'preamble': '',\n    # 'figure_align': 'htbp',\n}\n\n# Grouping the document tree into LaTeX files. List of tuples\n# (source start file, target name, title,\n#  author, documentclass [howto, manual, or own class]).\nlatex_documents = [\n    (\n        master_doc,\n        'JupyterHub.tex',\n        u'JupyterHub Documentation',\n        u'Project Jupyter team',\n        'manual',\n    )\n]\n\n# latex_logo = None\n# latex_use_parts = False\n# latex_show_pagerefs = False\n# latex_show_urls = False\n# latex_appendices = []\n# latex_domain_indices = True\n\n\n# -- manual page output -------------------------------------------------\n\n# One entry per manual page. List of tuples\n# (source start file, name, description, authors, manual section).\nman_pages = [(master_doc, 'jupyterhub', u'JupyterHub Documentation', [author], 1)]\n\n# man_show_urls = False\n\n\n# -- Texinfo output -----------------------------------------------------\n\n# Grouping the document tree into Texinfo files. List of tuples\n# (source start file, target name, title, author,\n#  dir menu entry, description, category)\ntexinfo_documents = [\n    (\n        master_doc,\n        'JupyterHub',\n        u'JupyterHub Documentation',\n        author,\n        'JupyterHub',\n        'One line description of project.',\n        'Miscellaneous',\n    )\n]\n\n# texinfo_appendices = []\n# texinfo_domain_indices = True\n# texinfo_show_urls = 'footnote'\n# texinfo_no_detailmenu = False\n\n\n# -- Epub output --------------------------------------------------------\n\n# Bibliographic Dublin Core info.\nepub_title = project\nepub_author = author\nepub_publisher = author\nepub_copyright = copyright\n\n# A list of files that should not be packed into the epub file.\nepub_exclude_files = ['search.html']\n\n# -- Intersphinx ----------------------------------------------------------\n\nintersphinx_mapping = {'https://docs.python.org/3/': None}\n\n# -- Read The Docs --------------------------------------------------------\n\non_rtd = os.environ.get('READTHEDOCS', None) == 'True'\nif on_rtd:\n    # readthedocs.org uses their theme by default, so no need to specify it\n    # build rest-api, since RTD doesn't run make\n    from subprocess import check_call as sh\n\n    sh(['make', 'rest-api'], cwd=docs)\n\n# -- Spell checking -------------------------------------------------------\n\ntry:\n    import sphinxcontrib.spelling\nexcept ImportError:\n    pass\nelse:\n    extensions.append(\"sphinxcontrib.spelling\")\n\nspelling_word_list_filename = 'spelling_wordlist.txt'\n", "path": "docs/source/conf.py"}], "after_files": [{"content": "# -*- coding: utf-8 -*-\n#\nimport os\nimport shlex\nimport sys\n\n# Set paths\nsys.path.insert(0, os.path.abspath('.'))\n\n# -- General configuration ------------------------------------------------\n\n# Minimal Sphinx version\nneeds_sphinx = '1.4'\n\n# Sphinx extension modules\nextensions = [\n    'sphinx.ext.autodoc',\n    'sphinx.ext.intersphinx',\n    'sphinx.ext.napoleon',\n    'autodoc_traits',\n    'sphinx_copybutton',\n    'sphinx-jsonschema',\n]\n\ntemplates_path = ['_templates']\n\n# The master toctree document.\nmaster_doc = 'index'\n\n# General information about the project.\nproject = u'JupyterHub'\ncopyright = u'2016, Project Jupyter team'\nauthor = u'Project Jupyter team'\n\n# Autopopulate version\nfrom os.path import dirname\n\ndocs = dirname(dirname(__file__))\nroot = dirname(docs)\nsys.path.insert(0, root)\n\nimport jupyterhub\n\n# The short X.Y version.\nversion = '%i.%i' % jupyterhub.version_info[:2]\n# The full version, including alpha/beta/rc tags.\nrelease = jupyterhub.__version__\n\nlanguage = None\nexclude_patterns = []\npygments_style = 'sphinx'\ntodo_include_todos = False\n\n# Set the default role so we can use `foo` instead of ``foo``\ndefault_role = 'literal'\n\n# -- Source -------------------------------------------------------------\n\nimport recommonmark\nfrom recommonmark.transform import AutoStructify\n\n\ndef setup(app):\n    app.add_config_value('recommonmark_config', {'enable_eval_rst': True}, True)\n    app.add_stylesheet('custom.css')\n    app.add_transform(AutoStructify)\n\n\nsource_parsers = {'.md': 'recommonmark.parser.CommonMarkParser'}\n\nsource_suffix = ['.rst', '.md']\n# source_encoding = 'utf-8-sig'\n\n# -- Options for HTML output ----------------------------------------------\n\n# The theme to use for HTML and HTML Help pages.\nhtml_theme = 'pydata_sphinx_theme'\n\nhtml_logo = '_static/images/logo/logo.png'\nhtml_favicon = '_static/images/logo/favicon.ico'\n\n# Paths that contain custom static files (such as style sheets)\nhtml_static_path = ['_static']\n\nhtmlhelp_basename = 'JupyterHubdoc'\n\n# -- Options for LaTeX output ---------------------------------------------\n\nlatex_elements = {\n    # 'papersize': 'letterpaper',\n    # 'pointsize': '10pt',\n    # 'preamble': '',\n    # 'figure_align': 'htbp',\n}\n\n# Grouping the document tree into LaTeX files. List of tuples\n# (source start file, target name, title,\n#  author, documentclass [howto, manual, or own class]).\nlatex_documents = [\n    (\n        master_doc,\n        'JupyterHub.tex',\n        u'JupyterHub Documentation',\n        u'Project Jupyter team',\n        'manual',\n    )\n]\n\n# latex_logo = None\n# latex_use_parts = False\n# latex_show_pagerefs = False\n# latex_show_urls = False\n# latex_appendices = []\n# latex_domain_indices = True\n\n\n# -- manual page output -------------------------------------------------\n\n# One entry per manual page. List of tuples\n# (source start file, name, description, authors, manual section).\nman_pages = [(master_doc, 'jupyterhub', u'JupyterHub Documentation', [author], 1)]\n\n# man_show_urls = False\n\n\n# -- Texinfo output -----------------------------------------------------\n\n# Grouping the document tree into Texinfo files. List of tuples\n# (source start file, target name, title, author,\n#  dir menu entry, description, category)\ntexinfo_documents = [\n    (\n        master_doc,\n        'JupyterHub',\n        u'JupyterHub Documentation',\n        author,\n        'JupyterHub',\n        'One line description of project.',\n        'Miscellaneous',\n    )\n]\n\n# texinfo_appendices = []\n# texinfo_domain_indices = True\n# texinfo_show_urls = 'footnote'\n# texinfo_no_detailmenu = False\n\n\n# -- Epub output --------------------------------------------------------\n\n# Bibliographic Dublin Core info.\nepub_title = project\nepub_author = author\nepub_publisher = author\nepub_copyright = copyright\n\n# A list of files that should not be packed into the epub file.\nepub_exclude_files = ['search.html']\n\n# -- Intersphinx ----------------------------------------------------------\n\nintersphinx_mapping = {'https://docs.python.org/3/': None}\n\n# -- Read The Docs --------------------------------------------------------\n\non_rtd = os.environ.get('READTHEDOCS', None) == 'True'\nif on_rtd:\n    # readthedocs.org uses their theme by default, so no need to specify it\n    # build rest-api, since RTD doesn't run make\n    from subprocess import check_call as sh\n\n    sh(['make', 'rest-api'], cwd=docs)\n\n# -- Spell checking -------------------------------------------------------\n\ntry:\n    import sphinxcontrib.spelling\nexcept ImportError:\n    pass\nelse:\n    extensions.append(\"sphinxcontrib.spelling\")\n\nspelling_word_list_filename = 'spelling_wordlist.txt'\n", "path": "docs/source/conf.py"}]}