Encountered unknown tag 'end'

[liesauer]

Problem

File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/parser.py", line 59, in fail
raise exc(msg, lineno, self.name, self.filename)
jinja2.exceptions.TemplateSyntaxError: Encountered unknown tag 'end'. Jinja was looking for the following tags: 'endfor' or 'else'. The innermost block that needs to be closed is 'for'.

Procedure to reproduce the problem

make gettext

Error logs / results

# Sphinx version: 1.8.1
# Python version: 3.6.0 (CPython)
# Docutils version: 0.14 
# Jinja2 version: 2.10
# Last messages:
#   读取模板……[  4%] /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/alabaster/donate.html
#   
#   读取模板……[  6%] /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/alabaster/layout.html
#   
#   读取模板……[  8%] /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/alabaster/navigation.html
#   
#   读取模板……[ 10%] /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/alabaster/relations.html
#   
#   读取模板……[ 13%] /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/backends/web_backend/all_figures.html
#   
# Loaded extensions:
#   sphinx.ext.mathjax (1.8.1) from /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/sphinx/ext/mathjax.py
#   alabaster (0.7.11) from /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/alabaster/__init__.py
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/sphinx/cmd/build.py", line 304, in build_main
    app.build(args.force_all, filenames)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/sphinx/application.py", line 341, in build
    self.builder.build_update()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/sphinx/builders/__init__.py", line 347, in build_update
    len(to_build))
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/sphinx/builders/gettext.py", line 258, in build
    self._extract_from_template()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/sphinx/builders/gettext.py", line 252, in _extract_from_template
    for line, meth, msg in extract_translations(context):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/ext.py", line 214, in _extract
    source = self.environment.parse(source)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/environment.py", line 493, in parse
    self.handle_exception(exc_info, source_hint=source)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/_compat.py", line 37, in reraise
    raise value.with_traceback(tb)
  File "<unknown>", line 31, in template
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/environment.py", line 497, in _parse
    return Parser(self, source, name, encode_filename(filename)).parse()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/parser.py", line 901, in parse
    result = nodes.Template(self.subparse(), lineno=1)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/parser.py", line 883, in subparse
    rv = self.parse_statement()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/parser.py", line 130, in parse_statement
    return getattr(self, 'parse_' + self.stream.current.value)()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/parser.py", line 199, in parse_for
    body = self.parse_statements(('name:endfor', 'name:else'))
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/parser.py", line 165, in parse_statements
    result = self.subparse(end_tokens)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/parser.py", line 883, in subparse
    rv = self.parse_statement()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/parser.py", line 144, in parse_statement
    self.fail_unknown_tag(token.value, token.lineno)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/parser.py", line 97, in fail_unknown_tag
    return self._fail_ut_eof(name, self._end_token_stack, lineno)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/parser.py", line 90, in _fail_ut_eof
    self.fail(' '.join(message), lineno)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/jinja2/parser.py", line 59, in fail
    raise exc(msg, lineno, self.name, self.filename)
jinja2.exceptions.TemplateSyntaxError: Encountered unknown tag 'end'. Jinja was looking for the following tags: 'endfor' or 'else'. The innermost block that needs to be closed is 'for'.

Environment info

• OS: Mac
• Python version: 3.6.0 (CPython)
• Sphinx version: 1.8.1

[tk0miya]

It seems all_figures.html has broken because it uses {% end %}, not {% endfor %}.
https://github.com/matplotlib/matplotlib/blob/master/lib/matplotlib/backends/web_backend/all_figures.html#L31

[tk0miya]

Note: It would be nice if we handle the exception and emit better error message.

[tk0miya]

Now #5521 is merged. It simply warns about broken templates.
Thank you for reporting.