webpdf JSONDecodeError: Expecting value: line 1 column 2 (char 1)

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The test file contains only one print statement. When running the command: jupyter nbconvert --to webpdf .\test.ipynb --template classic --allow-error I get the following error.

Traceback:
Traceback (most recent call last): File "<frozen runpy>", line 198, in _run_module_as_main File "<frozen runpy>", line 88, in _run_code File "xxx\.venv\Scripts\jupyter-nbconvert.EXE\__main__.py", line 4, in <module> File "xxx\.venv\Lib\site-packages\nbconvert\__init__.py", line 6, in <module> from . import filters, postprocessors, preprocessors, writers File "xxx\.venv\Lib\site-packages\nbconvert\filters\__init__.py", line 8, in <module> from .markdown import ( File "xxx\.venv\Lib\site-packages\nbconvert\filters\markdown.py", line 13, in <module> from .markdown_mistune import markdown2html_mistune File "xxx\.venv\Lib\site-packages\nbconvert\filters\markdown_mistune.py", line 22, in <module> from nbconvert.filters.strings import add_anchor File "xxx\.venv\Lib\site-packages\nbconvert\filters\strings.py", line 23, in <module> from nbconvert.preprocessors.sanitize import _get_default_css_sanitizer File "xxx\.venv\Lib\site-packages\nbconvert\preprocessors\__init__.py", line 3, in <module> from nbclient.exceptions import CellExecutionError File "xxx\.venv\Lib\site-packages\nbclient\__init__.py", line 2, in <module> from .client import NotebookClient, execute File "xxx\.venv\Lib\site-packages\nbclient\client.py", line 19, in <module> from nbformat import NotebookNode File "xxx\.venv\Lib\site-packages\nbformat\__init__.py", line 14, in <module> from . import v1, v2, v3, v4 File "xxx\.venv\Lib\site-packages\nbformat\v4\__init__.py", line 24, in <module> from .convert import downgrade, upgrade File "xxx\.venv\Lib\site-packages\nbformat\v4\convert.py", line 12, in <module> from nbformat import v3, validator File "xxx\.venv\Lib\site-packages\nbformat\validator.py", line 16, in <module> from .json_compat import ValidationError, _validator_for_name, get_current_validator File "xxx\.venv\Lib\site-packages\nbformat\json_compat.py", line 12, in <module> import jsonschema File "xxx\.venv\Lib\site-packages\jsonschema\__init__.py", line 16, in <module> from jsonschema.validators import ( File "xxx\.venv\Lib\site-packages\jsonschema\validators.py", line 20, in <module> from jsonschema_specifications import REGISTRY as SPECIFICATIONS File "xxx\.venv\Lib\site-packages\jsonschema_specifications\__init__.py", line 10, in <module> REGISTRY = (_schemas() @ _EMPTY_REGISTRY).crawl() ~~~~~~~~~~~^~~~~~~~~~~~~~~~~ File "xxx\.venv\Lib\site-packages\referencing\_core.py", line 378, in __rmatmul__ for resource in new: File "xxx\.venv\Lib\site-packages\jsonschema_specifications\_core.py", line 37, in _schemas contents = json.loads(path.read_text(encoding="utf-8")) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Program Files\Python312\Lib\json\__init__.py", line 346, in loads return _default_decoder.decode(s) ^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Program Files\Python312\Lib\json\decoder.py", line 337, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end()) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Program Files\Python312\Lib\json\decoder.py", line 355, in raw_decode raise JSONDecodeError("Expecting value", s, err.value) from None json.decoder.JSONDecodeError: Expecting value: line 1 column 2 (char 1)

Package List:

Package                   Version
------------------------- -----------
asttokens                 2.4.1
attrs                     23.2.0
beautifulsoup4            4.12.3
bleach                    6.1.0
colorama                  0.4.6
comm                      0.2.2
contourpy                 1.2.0
cycler                    0.12.1
debugpy                   1.8.1
decorator                 5.1.1
defusedxml                0.7.1
et-xmlfile                1.1.0
executing                 2.0.1
fastjsonschema            2.19.1
fonttools                 4.49.0
greenlet                  3.0.3
ipykernel                 6.29.3
ipython                   8.22.2
jedi                      0.19.1
Jinja2                    3.1.3
jsonschema                4.21.1
jsonschema-specifications 2023.12.1
jupyter_client            8.6.1
jupyter_core              5.7.2
jupyterlab_pygments       0.3.0
kiwisolver                1.4.5
MarkupSafe                2.1.5
matplotlib                3.8.3
matplotlib-inline         0.1.6
mistune                   3.0.2
nb_pdf_template           4.0.0
nbclient                  0.10.0
nbconvert                 7.16.2
nbformat                  5.10.2
nest-asyncio              1.6.0
numpy                     1.26.4
openpyxl                  3.1.2
packaging                 24.0
pandas                    2.2.1
pandocfilters             1.5.1
parso                     0.8.3
pillow                    10.2.0
pip                       24.0
platformdirs              4.2.0
playwright                1.42.0
prompt-toolkit            3.0.43
psutil                    5.9.8
pure-eval                 0.2.2
pyee                      11.0.1
Pygments                  2.17.2
pyparsing                 3.1.2
python-dateutil           2.9.0.post0
pytz                      2024.1
pywin32                   306
pyzmq                     25.1.2
referencing               0.33.0
rpds-py                   0.18.0
six                       1.16.0
soupsieve                 2.5
stack-data                0.6.3
tinycss2                  1.2.1
tornado                   6.4
traitlets                 5.14.2
typing_extensions         4.10.0
tzdata                    2024.1
wcwidth                   0.2.13
webencodings              0.5.1