looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
writing output... [100%] index
ERROR: Command syntax error: Unknown option or option in arguments.
> write_json -compat-int /home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/docs/_build/html/_images/index-108-verilog-dff.json
>            ^
Running yosys: yosys -p 'prep -top top ; cd top; show -format svg -prefix /home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/docs/_build/html/_images/index-68-verilog-dff' /home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/docs/verilog/dff.v
Output file created: /home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/docs/_build/html/_images/index-68-verilog-dff.svg
Running yosys: yosys -p 'prep -top top ; cd top; show -format svg -prefix /home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/docs/_build/html/_images/index-88-verilog-dff' /home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/docs/verilog/dff.v
Output file created: /home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/docs/_build/html/_images/index-88-verilog-dff.svg
Running yosys: yosys -p 'prep -top top ; cd top; write_json -compat-int /home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/docs/_build/html/_images/index-108-verilog-dff.json' /home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/docs/verilog/dff.v
/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/sphinx/deprecation.py:52: RemovedInSphinx40Warning: sphinx.builders.html.DirectoryHTMLBuilder is deprecated. Check CHANGES for Sphinx API modifications.
  return getattr(self._module, name)
/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/readthedocs_ext/readthedocs.py:14: RemovedInSphinx40Warning: sphinx.builders.html.SingleFileHTMLBuilder is deprecated. Check CHANGES for Sphinx API modifications.
  from sphinx.builders.html import (DirectoryHTMLBuilder, SingleFileHTMLBuilder,

Traceback (most recent call last):
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/sphinx/cmd/build.py", line 280, in build_main
    app.build(args.force_all, filenames)
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/sphinx/application.py", line 348, in build
    self.builder.build_update()
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/sphinx/builders/__init__.py", line 299, in build_update
    len(to_build))
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/sphinx/builders/__init__.py", line 361, in build
    self.write(docnames, list(updated_docnames), method)
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/sphinx/builders/__init__.py", line 535, in write
    self._write_serial(sorted(docnames))
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/sphinx/builders/__init__.py", line 545, in _write_serial
    self.write_doc(docname, doctree)
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/sphinx/builders/html/__init__.py", line 597, in write_doc
    self.docwriter.write(doctree, destination)
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/docutils/writers/__init__.py", line 78, in write
    self.translate()
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/sphinx/writers/html.py", line 71, in translate
    self.document.walkabout(visitor)
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/docutils/nodes.py", line 214, in walkabout
    if child.walkabout(visitor):
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/docutils/nodes.py", line 214, in walkabout
    if child.walkabout(visitor):
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/docutils/nodes.py", line 214, in walkabout
    if child.walkabout(visitor):
  [Previous line repeated 2 more times]
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/docutils/nodes.py", line 206, in walkabout
    visitor.dispatch_visit(self)
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/site-packages/sphinx/util/docutils.py", line 468, in dispatch_visit
    method(node)
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/sphinxcontrib_verilog_diagrams.py", line 338, in html_visit_verilog_diagram
    render_diagram_html(self, node, node['code'], node['options'])
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/sphinxcontrib_verilog_diagrams.py", line 309, in render_diagram_html
    fname, outfn = render_diagram(self, code, options, format)
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/sphinxcontrib_verilog_diagrams.py", line 291, in render_diagram
    verilog_path, outfn, module=options['module'], flatten=options['flatten'])
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/sphinxcontrib_verilog_diagrams.py", line 261, in diagram_netlistsvg
    """.format(top=module, flatten=flatten, ojson=ojson).strip())
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/sphinxcontrib_verilog_diagrams.py", line 202, in run_yosys
    subprocess.check_output(ycmd, shell=True)
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/subprocess.py", line 411, in check_output
    **kwargs).stdout
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/subprocess.py", line 512, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command 'yosys -p 'prep -top top ; cd top; write_json -compat-int /home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/docs/_build/html/_images/index-108-verilog-dff.json' /home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/docs/verilog/dff.v' returned non-zero exit status 1.

Exception occurred:
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/conda/latest/lib/python3.7/subprocess.py", line 512, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command 'yosys -p 'prep -top top ; cd top; write_json -compat-int /home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/docs/_build/html/_images/index-108-verilog-dff.json' /home/docs/checkouts/readthedocs.org/user_builds/sphinxcontrib-verilog-diagrams/checkouts/latest/docs/verilog/dff.v' returned non-zero exit status 1.
The full traceback has been saved in /tmp/sphinx-err-5duhsu2j.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!