500 Error when downloading Jupyter notebook as ipynb file

I am somewhat new to Jupyter. I use Windows and I specifically use Jupyter through Anaconda. I am trying to downloand a notebook to link with my Github account. I get a 500 error when I try to do this. Below is the error log in Jupyter:

[E 17:58:15.342 NotebookApp] 500 GET /nbconvert/notebook/rbkellam/fantasy-football-sharpe-ratio/Fantasy%20Football%20Data%20Analysis.ipynb?download=true (::1) 618.15ms referer=http://localhost:8888/notebooks/rbkellam/fantasy-football-sharpe-ratio/Fantasy%20Football%20Data%20Analysis.ipynb
[E 17:58:22.275 NotebookApp] Uncaught exception GET /nbconvert/pdf/rbkellam/fantasy-football-sharpe-ratio/Fantasy%20Football%20Data%20Analysis.ipynb?download=true (::1)
HTTPServerRequest(protocol=‘http’, host=‘localhost:8888’, method=‘GET’, uri=’/nbconvert/pdf/rbkellam/fantasy-football-sharpe-ratio/Fantasy%20Football%20Data%20Analysis.ipynb?download=true’, version=‘HTTP/1.1’, remote_ip=’::1’)
Traceback (most recent call last):
File “C:\Users\sueke\anaconda3\lib\site-packages\tornado\web.py”, line 1592, in _execute
result = yield result
File “C:\Users\sueke\anaconda3\lib\site-packages\tornado\gen.py”, line 1133, in run
value = future.result()
File “C:\Users\sueke\anaconda3\lib\site-packages\tornado\gen.py”, line 1147, in run
yielded = self.gen.send(value)
File “C:\Users\sueke\anaconda3\lib\site-packages\notebook\nbconvert\handlers.py”, line 115, in get
mod_date = model[‘last_modified’].strftime(text.date_format)
AttributeError: ‘str’ object has no attribute ‘strftime’
[E 17:58:22.290 NotebookApp] {
“Host”: “localhost:8888”,
“Connection”: “keep-alive”,
“Sec-Ch-Ua”: “” Not A;Brand";v=“99”, “Chromium”;v=“90”, “Google Chrome”;v=“90"”,
“Sec-Ch-Ua-Mobile”: “?0”,
“Upgrade-Insecure-Requests”: “1”,
“User-Agent”: “Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36”,
“Accept”: “text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,/;q=0.8,application/signed-exchange;v=b3;q=0.9”,
“Sec-Fetch-Site”: “same-origin”,
“Sec-Fetch-Mode”: “navigate”,
“Sec-Fetch-Dest”: “document”,
“Referer”: “http://localhost:8888/notebooks/rbkellam/fantasy-football-sharpe-ratio/Fantasy%20Football%20Data%20Analysis.ipynb”,
“Accept-Encoding”: “gzip, deflate, br”,
“Accept-Language”: “en-US,en;q=0.9”,
“Cookie”: “_xsrf=2|00ca346b|27c389407de3f1dfc1a8f0c45467f62c|1620069233; username-localhost-8889=“2|1:0|10:1621022224|23:username-localhost-8889|44:YTVhOWQ1ZTYzMTZiNGIwYjgyZTVkNWEwZDdiMGQ2OWI=|1900461d7387ba021c61b5151f267ae6297747ed212b79247e67ab7145a411ac”; username-localhost-8891=“2|1:0|10:1621194964|23:username-localhost-8891|44:ZTE3OTU2ZmU2ODFjNGNmZTgzYmM0MDNmZDBmMTcxYmI=|716fc526e9642746dbe3ee3be90f45fb5eb6fe4d5ce69d38a189d668129bcbac”; username-localhost-8890=“2|1:0|10:1621194964|23:username-localhost-8890|44:OTFjMWZhZmM3Y2ZmNDgyOWEyNTI5ODZjZmM2YWE4MmQ=|cc6fb5e180f8ab19996a39fdd58748c3b0f734b09b3f8fe104cfab5ae39bcaa3”; username-localhost-8888=“2|1:0|10:1622066277|23:username-localhost-8888|44:NDkzNDNjMjQ1NjRmNDMyNTlkOGRhYmM0YTYwZGZkOTg=|48b2df8f238ad4077cb52ecbc676ef8e04f3d51487b0c67b42c5941524cad54e””
}
[E 17:58:22.371 NotebookApp] 500 GET /nbconvert/pdf/rbkellam/fantasy-football-sharpe-ratio/Fantasy%20Football%20Data%20Analysis.ipynb?download=true (::1) 434.11ms referer=http://localhost:8888/notebooks/rbkellam/fantasy-football-sharpe-ratio/Fantasy%20Football%20Data%20Analysis.ipynb

What should I do

Can you share conda list? It might be that a package is out of date. It’s epxecting a datetime object in the last_modified model, when it’s presumably getting a timestamp string.

Name Version Build Channel

alabaster 0.7.12 pyhd3eb1b0_0
anaconda-client 1.7.2 py38_0
anaconda-navigator 1.10.0 py38_0
anaconda-project 0.9.1 pyhd3eb1b0_1
appdirs 1.4.4 py_0
argh 0.26.2 py38_0
argon2-cffi 20.1.0 py38h2bbff1b_1
asn1crypto 1.4.0 py_0
astroid 2.5 py38haa95532_1
astropy 4.2 py38h2bbff1b_0
async_generator 1.10 pyhd3eb1b0_0
atomicwrites 1.4.0 py_0
attrs 20.3.0 pyhd3eb1b0_0
autopep8 1.5.6 pyhd3eb1b0_0
babel 2.9.0 pyhd3eb1b0_0
backcall 0.2.0 pyhd3eb1b0_0
backoff 1.10.0 pypi_0 pypi
backports 1.0 pyhd3eb1b0_2
backports.functools_lru_cache 1.6.3 pyhd3eb1b0_0
backports.shutil_get_terminal_size 1.0.0 pyhd3eb1b0_3
backports.tempfile 1.0 pyhd3eb1b0_1
backports.weakref 1.0.post1 py_1
bcrypt 3.2.0 py38he774522_0
beautifulsoup4 4.9.3 pyha847dfd_0
bitarray 1.7.0 py38h2bbff1b_1
bkcharts 0.2 py38_0
black 19.10b0 py_0
blas 1.0 mkl
bleach 3.3.0 pyhd3eb1b0_0
blosc 1.21.0 h19a0ad4_0
bokeh 2.3.0 py38haa95532_0
boto 2.49.0 py38_0
boto3 1.17.17 pypi_0 pypi
botocore 1.20.17 pypi_0 pypi
bottleneck 1.3.2 py38h2a96729_1
brotlipy 0.7.0 py38h2bbff1b_1003
bzip2 1.0.8 he774522_0
ca-certificates 2021.4.13 haa95532_1
cached-property 1.5.2 pypi_0 pypi
certifi 2020.12.5 py38haa95532_0
cffi 1.14.5 py38hcd4344a_0
chardet 4.0.0 py38haa95532_1003
click 6.7 pypi_0 pypi
cloudpickle 1.6.0 py_0
clyent 1.2.2 py38_1
colorama 0.4.4 pyhd3eb1b0_0
comtypes 1.1.8 py38haa95532_1002
conda 4.10.1 py38haa95532_1
conda-build 3.21.4 py38haa95532_0
conda-env 2.6.0 1
conda-package-handling 1.7.2 py38h76e460a_0
conda-verify 3.4.2 py_1
configparser 3.8.1 pypi_0 pypi
console_shortcut 0.1.1 4
contextlib2 0.6.0.post1 py_0
cryptography 3.4.7 py38h71e12ea_0
curl 7.71.1 h2a8f88b_1
cycler 0.10.0 py38_0
cython 0.29.22 py38hd77b12b_0
cytoolz 0.11.0 py38he774522_0
dask 2021.2.0 pyhd3eb1b0_0
dask-core 2021.2.0 pyhd3eb1b0_0
datadotworld 1.7.0 pypi_0 pypi
datapackage 1.15.2 pypi_0 pypi
decorator 5.0.5 pyhd3eb1b0_0
defusedxml 0.7.1 pyhd3eb1b0_0
diff-match-patch 20200713 py_0
distributed 2021.2.0 py38haa95532_0
docutils 0.17 py38haa95532_1
dwcontents 1.0.0b5 pypi_0 pypi
entrypoints 0.3 py38_0
et_xmlfile 1.0.1 py_1001
fastcache 1.1.0 py38he774522_0
filelock 3.0.12 pyhd3eb1b0_1
flake8 3.9.0 pyhd3eb1b0_0
flask 1.1.2 pyhd3eb1b0_0
freetype 2.10.4 hd328e21_0
fsspec 0.8.3 py_0
future 0.18.2 py38_1
get_terminal_size 1.0.0 h38e98db_0
gevent 21.1.1 py38h2bbff1b_1
glob2 0.7 pyhd3eb1b0_0
gmpy2 2.0.8 py38h7edee0f_3
greenlet 1.0.0 py38hd77b12b_2
h5py 2.10.0 py38h5e291fa_0
hdf5 1.10.4 h7ebc959_0
heapdict 1.0.1 py_0
html5lib 1.1 py_0
icc_rt 2019.0.0 h0cc432a_1
icu 58.2 ha925a31_3
idna 2.10 pyhd3eb1b0_0
ijson 3.1.3 pypi_0 pypi
imageio 2.9.0 py_0
imagesize 1.2.0 pyhd3eb1b0_0
importlib-metadata 3.10.0 py38haa95532_0
importlib_metadata 3.10.0 hd3eb1b0_0
iniconfig 1.1.1 pyhd3eb1b0_0
intel-openmp 2020.2 254
intervaltree 3.1.0 py_0
ipykernel 5.3.4 py38h5ca1d4c_0
ipython 5.10.0 pypi_0 pypi
ipython_genutils 0.2.0 pyhd3eb1b0_1
ipywidgets 7.6.3 pyhd3eb1b0_1
isodate 0.6.0 pypi_0 pypi
isort 5.8.0 pyhd3eb1b0_0
itsdangerous 1.1.0 pyhd3eb1b0_0
jdcal 1.4.1 py_0
jedi 0.17.2 py38haa95532_1
jinja2 2.11.3 pyhd3eb1b0_0
jmespath 0.10.0 pypi_0 pypi
joblib 1.0.1 pyhd3eb1b0_0
jpeg 9b hb83a4c4_2
json5 0.9.5 py_0
jsonlines 2.0.0 pypi_0 pypi
jsonpointer 2.0 pypi_0 pypi
jsonschema 3.2.0 py_2
jupyter 1.0.0 py38_7
jupyter_client 6.1.12 pyhd3eb1b0_0
jupyter_console 6.2.0 py_0
jupyter_core 4.7.1 py38haa95532_0
jupyterlab_pygments 0.1.2 py_0
jupyterlab_widgets 1.0.0 pyhd3eb1b0_1
keyring 22.3.0 py38haa95532_0
kiwisolver 1.3.1 py38hd77b12b_0
krb5 1.18.2 hc04afaa_0
lazy-object-proxy 1.6.0 py38h2bbff1b_0
libarchive 3.4.2 h5e25573_0
libcurl 7.71.1 h2a8f88b_1
libiconv 1.15 h1df5818_7
liblief 0.10.1 ha925a31_0
libllvm9 9.0.1 h21ff451_0
libpng 1.6.37 h2a8f88b_0
libsodium 1.0.18 h62dcd97_0
libspatialindex 1.9.3 h6c2663c_0
libssh2 1.9.0 h7a1dbc1_1
libtiff 4.2.0 hd0e1b90_0
libxml2 2.9.10 hb89e7f3_3
libxslt 1.1.34 he774522_0
linear-tsv 1.1.0 pypi_0 pypi
llvmlite 0.35.0 py38h34b8924_4
locket 0.2.1 py38haa95532_1
lxml 4.6.2 py38h9b66d53_0
lz4-c 1.9.3 h2bbff1b_0
lzo 2.10 he774522_2
m2w64-gcc-libgfortran 5.3.0 6
m2w64-gcc-libs 5.3.0 7
m2w64-gcc-libs-core 5.3.0 7
m2w64-gmp 6.1.0 2
m2w64-libwinpthread-git 5.0.0.4634.697f757 2
markupsafe 1.1.1 py38he774522_0
matplotlib 3.3.4 py38haa95532_0
matplotlib-base 3.3.4 py38h49ac443_0
mccabe 0.6.1 py38_1
menuinst 1.4.16 py38he774522_1
mistune 0.8.4 py38he774522_1000
mkl 2020.2 256
mkl-service 2.3.0 py38h196d8e1_0
mkl_fft 1.3.0 py38h46781fe_0
mkl_random 1.1.1 py38h47e9c7a_0
mock 4.0.3 pyhd3eb1b0_0
more-itertools 8.7.0 pyhd3eb1b0_0
mpc 1.1.0 h7edee0f_1
mpfr 4.0.2 h62dcd97_1
mpir 3.0.0 hec2e145_1
mpmath 1.1.0 py38_0
msgpack-python 1.0.2 py38h59b6b97_1
msys2-conda-epoch 20160418 1
multipledispatch 0.6.0 py38_0
mypy_extensions 0.4.3 py38_0
navigator-updater 0.2.1 py38_0
nbclient 0.5.3 pyhd3eb1b0_0
nbconvert 5.6.1 py38_0
nbformat 5.1.3 pyhd3eb1b0_0
nest-asyncio 1.5.1 pyhd3eb1b0_0
networkx 2.5 py_0
nltk 3.5 py_0
nose 1.3.7 pyhd3eb1b0_1006
notebook 5.7.10 pypi_0 pypi
numba 0.52.0 py38hf11a4ad_0
numexpr 2.7.3 py38hcbcaa1e_0
numpy 1.19.2 py38hadc3359_0
numpy-base 1.19.2 py38ha3acd2a_0
numpydoc 1.1.0 pyhd3eb1b0_1
olefile 0.46 py_0
openpyxl 3.0.6 pyhd3eb1b0_0
openssl 1.1.1k h2bbff1b_0
packaging 20.9 pyhd3eb1b0_0
pandas 1.2.3 py38hf11a4ad_0
pandoc 2.12 haa95532_0
pandocfilters 1.4.3 py38haa95532_1
paramiko 2.7.2 py_0
parso 0.7.0 py_0
partd 1.1.0 py_0
path 15.1.2 py38haa95532_0
path.py 12.5.0 0
pathlib2 2.3.5 py38haa95532_2
pathspec 0.7.0 py_0
pathtools 0.1.2 py_1
patsy 0.5.1 py38_0
pep8 1.7.1 py38_0
pexpect 4.8.0 pyhd3eb1b0_3
pickleshare 0.7.5 pyhd3eb1b0_1003
pillow 8.2.0 py38h4fa10fc_0
pip 21.0.1 py38haa95532_0
pkginfo 1.7.0 py38haa95532_0
pluggy 0.13.1 py38haa95532_0
ply 3.11 py38_0
powershell_shortcut 0.0.1 3
prometheus_client 0.9.0 pyhd3eb1b0_0
prompt-toolkit 3.0.18 pypi_0 pypi
prompt_toolkit 3.0.8 0
psutil 5.8.0 py38h2bbff1b_1
ptyprocess 0.7.0 pyhd3eb1b0_2
py 1.10.0 pyhd3eb1b0_0
py-lief 0.10.1 py38ha925a31_0
pycodestyle 2.6.0 pyhd3eb1b0_0
pycosat 0.6.3 py38h2bbff1b_0
pycparser 2.20 py_2
pycurl 7.43.0.6 py38h7a1dbc1_0
pydocstyle 6.0.0 pyhd3eb1b0_0
pyerfa 1.7.2 py38h2bbff1b_0
pyflakes 2.2.0 pyhd3eb1b0_0
pygments 2.5.2 pypi_0 pypi
pylint 2.7.4 py38haa95532_1
pyls-black 0.4.6 hd3eb1b0_0
pyls-spyder 0.3.2 pyhd3eb1b0_0
pynacl 1.4.0 py38h62dcd97_1
pyodbc 4.0.30 py38ha925a31_0
pyopenssl 20.0.1 pyhd3eb1b0_1
pyparsing 2.4.7 pyhd3eb1b0_0
pyqt 5.9.2 py38ha925a31_4
pyreadline 2.1 py38_1
pyrsistent 0.17.3 py38he774522_0
pysocks 1.7.1 py38haa95532_0
pytables 3.6.1 py38ha5be198_0
pytest 6.2.2 py38haa95532_2
python 3.8.8 hdbf39b2_4
python-dateutil 2.8.1 pyhd3eb1b0_0
python-jsonrpc-server 0.4.0 py_0
python-language-server 0.36.2 pyhd3eb1b0_0
python-libarchive-c 2.9 pyhd3eb1b0_1
pytz 2021.1 pyhd3eb1b0_0
pywavelets 1.1.1 py38he774522_2
pywin32 227 py38he774522_1
pywin32-ctypes 0.2.0 py38_1000
pywinpty 0.5.7 py38_0
pyyaml 5.4.1 py38h2bbff1b_1
pyzmq 20.0.0 py38hd77b12b_1
qdarkstyle 3.0.2 pyhd3eb1b0_0
qt 5.9.7 vc14h73c81de_0
qtawesome 1.0.2 pyhd3eb1b0_0
qtconsole 5.0.2 pyhd3eb1b0_0
qtpy 1.9.0 py_0
regex 2021.4.4 py38h2bbff1b_0
requests 2.25.1 pyhd3eb1b0_0
rfc3986 1.4.0 pypi_0 pypi
rope 0.18.0 py_0
rtree 0.9.4 py38h21ff451_1
ruamel_yaml 0.15.100 py38h2bbff1b_0
s3transfer 0.3.4 pypi_0 pypi
scikit-image 0.17.2 py38h1e1f486_0
scikit-learn 0.24.1 py38hf11a4ad_0
scipy 1.6.1 py38h14eb087_0
seaborn 0.11.1 pyhd3eb1b0_0
send2trash 1.5.0 pyhd3eb1b0_1
setuptools 52.0.0 py38haa95532_0
simplegeneric 0.8.1 py38_2
singledispatch 3.6.1 pyhd3eb1b0_1001
sip 4.19.13 py38ha925a31_0
six 1.15.0 py38haa95532_0
snappy 1.1.8 h33f27b4_0
snowballstemmer 2.1.0 pyhd3eb1b0_0
sortedcollections 2.1.0 pyhd3eb1b0_0
sortedcontainers 2.3.0 pyhd3eb1b0_0
soupsieve 2.2.1 pyhd3eb1b0_0
sphinx 3.5.3 pyhd3eb1b0_0
sphinxcontrib 1.0 py38_1
sphinxcontrib-applehelp 1.0.2 pyhd3eb1b0_0
sphinxcontrib-devhelp 1.0.2 pyhd3eb1b0_0
sphinxcontrib-htmlhelp 1.0.3 pyhd3eb1b0_0
sphinxcontrib-jsmath 1.0.1 pyhd3eb1b0_0
sphinxcontrib-qthelp 1.0.3 pyhd3eb1b0_0
sphinxcontrib-serializinghtml 1.1.4 pyhd3eb1b0_0
sphinxcontrib-websupport 1.2.4 py_0
spyder 4.2.1 py38haa95532_1
spyder-kernels 1.10.2 py38haa95532_0
sqlalchemy 1.3.23 py38h2bbff1b_0
sqlite 3.35.4 h2bbff1b_0
statsmodels 0.12.2 py38h2bbff1b_0
sympy 1.7.1 py38haa95532_0
tableschema 1.20.2 pypi_0 pypi
tabulator 1.53.4 pypi_0 pypi
tbb 2020.3 h74a9793_0
tblib 1.7.0 py_0
terminado 0.9.2 py38haa95532_0
testpath 0.4.4 pyhd3eb1b0_0
textdistance 4.2.1 pyhd3eb1b0_0
threadpoolctl 2.1.0 pyh5ca1d4c_0
three-merge 0.1.1 pyhd3eb1b0_0
tifffile 2020.10.1 py38h8c2d366_2
tk 8.6.10 he774522_0
toml 0.10.2 pyhd3eb1b0_0
toolz 0.11.1 pyhd3eb1b0_0
tornado 5.1.1 pypi_0 pypi
tqdm 4.59.0 pyhd3eb1b0_1
traitlets 5.0.5 pyhd3eb1b0_0
typed-ast 1.4.2 py38h2bbff1b_1
typing_extensions 3.7.4.3 pyha847dfd_0
ujson 4.0.2 py38hd77b12b_0
unicodecsv 0.14.1 py38_0
urllib3 1.26.4 pyhd3eb1b0_0
vc 14.2 h21ff451_1
vs2015_runtime 14.27.29016 h5e58377_2
watchdog 1.0.2 py38haa95532_1
wcwidth 0.2.5 py_0
webencodings 0.5.1 py38_1
werkzeug 1.0.1 pyhd3eb1b0_0
wheel 0.36.2 pyhd3eb1b0_0
widgetsnbextension 3.5.1 py38_0
win_inet_pton 1.1.0 py38haa95532_0
win_unicode_console 0.5 py38_0
wincertstore 0.2 py38_0
winpty 0.4.3 4
wrapt 1.12.1 py38he774522_1
xlrd 2.0.1 pyhd3eb1b0_0
xlsxwriter 1.3.7 pyhd3eb1b0_0
xlwings 0.22.3 py38haa95532_0
xlwt 1.3.0 py38_0
xmltodict 0.12.0 py_0
xz 5.2.5 h62dcd97_0
yaml 0.2.5 he774522_0
yapf 0.31.0 pyhd3eb1b0_0
zeromq 4.3.3 ha925a31_3
zict 2.0.0 pyhd3eb1b0_0
zipp 3.4.1 pyhd3eb1b0_0
zlib 1.2.11 h62dcd97_4
zope 1.0 py38_1
zope.event 4.5.0 py38_0
zope.interface 5.2.0 py38h2bbff1b_0
zstd 1.4.5 h04227a9_0

Hope this helps!

Hi Minrk - did you have any additional comment on this? Anything else I can provide? Not sure what to do next. Thanks!

Minrk – I upgraded to the newest version of nbconvert (6.0.7 I beleive) and I also tried cutting off the “.strftime(text.date_format)” part of line 115, and also tried strptime instead, All of these options still lead to the 500 error. What should I do?