Monte carlo not running for technosphere #1618
Description
Updating AB
- Yes, I have updated AB and still experience this issue
What happened?
Hello,
I am running a Monte Carlo simulation in AB v.2.11.2 using the ecoinvent 3.11 database. Everything seems to work when I test processes originally contained in the database. But when I create my own model — even after adding all the uncertain input requirements — the Monte Carlo simulation does not run for the technosphere. I get the error:
ERROR | Real, positive scale (sigma) values are required for lognormal uncertainties.
At first I thought I had missed adding the sigma value, but even after verifying that everything is set properly the Monte Carlo analysis gives the same error. It does not matter if I select another type of distribution. I created a dummy process just to verify, and the error persists.
I also updated AB and tried an older version (2.10) and still have the problem. Is it just me, or has anyone else experienced this?
Thanks,
Relevant errors
ERROR | Real, positive scale (sigma) values are required for lognormal uncertainties.Operating system
Windows 10
Conda environment
# Name Version Build Channel
_libavif_api 1.3.0 h57928b3_2 conda-forge
ab-plugin-scenariolink 0.1.6 py_0 romainsacchi
activity-browser 2.11.2 pyhd8ed1ab_0 conda-forge
annotated-types 0.7.0 pyhd8ed1ab_0 conda-forge
aom 3.9.1 he0c23c2_0 conda-forge
appdirs 1.4.4 pyh9f0ad1d_0 conda-forge
arrow 1.3.0 pyhd8ed1ab_0 conda-forge
asteval 1.0.5 pyhd8ed1ab_0 conda-forge
astunparse 1.6.3 pyhd8ed1ab_2 conda-forge
attrs 25.3.0 pyh71513ae_0 conda-forge
blinker 1.9.0 pyhff2d567_0 conda-forge
blosc 1.21.6 h85f69ea_0 conda-forge
boto3 1.40.34 pyhd8ed1ab_0 conda-forge
botocore 1.40.34 pyhd8ed1ab_0 conda-forge
brightway2 2.4.6 pyhd8ed1ab_0 conda-forge
brotli 1.1.0 h2466b09_2 conda-forge
brotli-bin 1.1.0 h2466b09_2 conda-forge
brotli-python 1.1.0 py311hda3d55a_2 conda-forge
brotlicffi 1.1.0.0 py311hda3d55a_2 conda-forge
bw2analyzer 0.10 pyhd8ed1ab_0 conda-forge
bw2calc 1.8.2 py311h1ea47a8_0 conda-forge
bw2data 3.6.6 pyhd8ed1ab_0 conda-forge
bw2io 0.8.12 pyhd8ed1ab_0 conda-forge
bw2parameters 1.1.0 pyhd8ed1ab_0 conda-forge
bw_migrations 0.2 pyhd8ed1ab_0 conda-forge
bzip2 1.0.8 h2466b09_7 conda-forge
ca-certificates 2025.11.12 h4c7d964_0 conda-forge
cached-property 1.5.2 hd8ed1ab_1 conda-forge
cached_property 1.5.2 pyha770c72_1 conda-forge
cchardet 2.1.7 py311h12c1d0e_5 conda-forge
certifi 2025.11.12 pyhd8ed1ab_0 conda-forge
cffi 1.17.1 py311he736701_0 conda-forge
chardet 5.2.0 pyhd8ed1ab_3 conda-forge
charset-normalizer 3.4.0 pyhd8ed1ab_0 conda-forge
click 8.1.7 win_pyh7428d3b_0 conda-forge
click-plugins 1.1.1.2 pyhd8ed1ab_0 conda-forge
cligj 0.7.2 pyhd8ed1ab_2 conda-forge
colorama 0.4.6 pyhd8ed1ab_0 conda-forge
constructive_geometries 1.0 pyhd8ed1ab_2 conda-forge
contourpy 1.3.1 py311h3257749_0 conda-forge
country_converter 1.3.1 pyhd8ed1ab_0 conda-forge
cycler 0.12.1 pyhd8ed1ab_0 conda-forge
dataflows-tabulator 1.54.3 pyhd8ed1ab_1 conda-forge
datapackage 1.15.2 pyh44b312d_0 conda-forge
dav1d 1.2.1 hcfcfb64_0 conda-forge
dill 0.3.9 pyhd8ed1ab_0 conda-forge
docopt 0.6.2 py_1 conda-forge
ecoinvent_interface 3.1 pyhd8ed1ab_1 conda-forge
eight 1.0.1 pyhd8ed1ab_4 conda-forge
et_xmlfile 2.0.0 pyhd8ed1ab_0 conda-forge
fasteners 0.17.3 pyhd8ed1ab_0 conda-forge
fiona 1.10.1 py311haedb144_3 conda-forge
flask 3.1.0 pyhff2d567_0 conda-forge
fonttools 4.54.1 py311h5082efb_1 conda-forge
freetype 2.12.1 hdaf720e_2 conda-forge
freexl 2.0.0 h8276f4a_0 conda-forge
future 1.0.0 pyhd8ed1ab_0 conda-forge
geos 3.13.0 h5a68840_0 conda-forge
geotiff 1.7.4 h887f4e7_0 conda-forge
glib 2.82.2 h7025463_0 conda-forge
glib-tools 2.82.2 h4394cf3_0 conda-forge
greenlet 3.2.4 py311h3e6a449_1 conda-forge
gst-plugins-base 1.24.7 hb0a98b8_0 conda-forge
gstreamer 1.24.7 h5006eae_0 conda-forge
h2 4.1.0 pyhd8ed1ab_0 conda-forge
hpack 4.0.0 pyh9f0ad1d_0 conda-forge
hyperframe 6.0.1 pyhd8ed1ab_0 conda-forge
icu 75.1 he0c23c2_0 conda-forge
idna 3.10 pyhd8ed1ab_0 conda-forge
ijson 3.4.0 pyhd8ed1ab_0 conda-forge
importlib-metadata 8.5.0 pyha770c72_0 conda-forge
importlib_metadata 8.5.0 hd8ed1ab_0 conda-forge
inflate64 1.0.0 py311he736701_2 conda-forge
intel-openmp 2024.2.1 h57928b3_1083 conda-forge
isodate 0.7.2 pyhd8ed1ab_1 conda-forge
itsdangerous 2.2.0 pyhd8ed1ab_0 conda-forge
jinja2 3.1.4 pyhd8ed1ab_0 conda-forge
jmespath 1.0.1 pyhd8ed1ab_1 conda-forge
jsonlines 4.0.0 pyhd8ed1ab_0 conda-forge
jsonpointer 3.0.0 py311h1ea47a8_2 conda-forge
jsonschema 4.25.1 pyhe01879c_0 conda-forge
jsonschema-specifications 2025.9.1 pyhcf101f3_0 conda-forge
kiwisolver 1.4.7 py311h3257749_0 conda-forge
krb5 1.21.3 hdf4eb48_0 conda-forge
lcms2 2.16 h67d730c_0 conda-forge
lerc 4.0.0 h63175ca_0 conda-forge
libarchive 3.7.7 h88ece9c_0 conda-forge
libavif16 1.3.0 he916da2_2 conda-forge
libblas 3.9.0 25_win64_mkl conda-forge
libbrotlicommon 1.1.0 h2466b09_2 conda-forge
libbrotlidec 1.1.0 h2466b09_2 conda-forge
libbrotlienc 1.1.0 h2466b09_2 conda-forge
libcblas 3.9.0 25_win64_mkl conda-forge
libclang13 19.1.3 default_ha5278ca_0 conda-forge
libcurl 8.14.1 h88aaa65_0 conda-forge
libde265 1.0.15 h91493d7_0 conda-forge
libdeflate 1.22 h2466b09_0 conda-forge
libexpat 2.6.4 he0c23c2_0 conda-forge
libffi 3.4.2 h8ffe710_5 conda-forge
libgdal-core 3.10.0 ha193a43_5 conda-forge
libglib 2.82.2 h7025463_0 conda-forge
libheif 1.18.2 gpl_hc631cee_100 conda-forge
libhwloc 2.11.1 default_h8125262_1000 conda-forge
libiconv 1.17 hcfcfb64_2 conda-forge
libintl 0.22.5 h5728263_3 conda-forge
libintl-devel 0.22.5 h5728263_3 conda-forge
libjpeg-turbo 3.0.0 hcfcfb64_1 conda-forge
libkml 1.3.0 h538826c_1021 conda-forge
liblapack 3.9.0 25_win64_mkl conda-forge
libogg 1.3.5 h2466b09_0 conda-forge
libpng 1.6.44 h3ca93ac_0 conda-forge
librttopo 1.1.0 hd4c2148_17 conda-forge
libspatialite 5.1.0 h939089a_11 conda-forge
libsqlite 3.47.0 h2466b09_1 conda-forge
libssh2 1.11.1 h9aa295b_0 conda-forge
libtiff 4.7.0 hfc51747_1 conda-forge
libvorbis 1.3.7 h0e60522_0 conda-forge
libwebp 1.4.0 h2466b09_0 conda-forge
libwebp-base 1.4.0 hcfcfb64_0 conda-forge
libxcb 1.16 h013a479_1 conda-forge
libxml2 2.13.5 h442d1da_0 conda-forge
libxslt 1.1.39 h3df6e99_0 conda-forge
libzlib 1.3.1 h2466b09_2 conda-forge
linear-tsv 1.1.0 py_1 conda-forge
llvmlite 0.44.0 py311h7c248df_2 conda-forge
lxml 5.3.0 py311hf779c20_2 conda-forge
lz4-c 1.9.4 hcfcfb64_0 conda-forge
lzo 2.10 h6a83c73_1002 conda-forge
m2w64-gcc-libgfortran 5.3.0 6 conda-forge
m2w64-gcc-libs 5.3.0 7 conda-forge
m2w64-gcc-libs-core 5.3.0 7 conda-forge
m2w64-gmp 6.1.0 2 conda-forge
m2w64-libwinpthread-git 5.0.0.4634.697f757 2 conda-forge
markupsafe 3.0.2 py311h5082efb_0 conda-forge
matplotlib-base 3.9.2 py311h8f1b1e4_2 conda-forge
minizip 4.0.6 hb638d1e_0 conda-forge
mkl 2024.2.2 h66d3029_14 conda-forge
mrio_common_metadata 0.2.1 pyhd8ed1ab_0 conda-forge
msys2-conda-epoch 20160418 1 conda-forge
multiprocess 0.70.17 py311he736701_0 conda-forge
multivolumefile 0.2.3 pyhd8ed1ab_0 conda-forge
munkres 1.1.4 pyh9f0ad1d_0 conda-forge
networkx 3.4.2 pyh267e887_2 conda-forge
numba 0.61.2 py311h7afb941_1 conda-forge
numpy 1.26.4 py311h0b4df5a_0 conda-forge
openjpeg 2.5.2 h3d672ee_0 conda-forge
openpyxl 3.1.5 py311ha68e1ae_1 conda-forge
openssl 3.6.0 h725018a_0 conda-forge
packaging 24.2 pyhd8ed1ab_0 conda-forge
pandas 2.2.3 py311hcf9f919_1 conda-forge
pathos 0.3.3 pyhd8ed1ab_0 conda-forge
patsy 1.0.1 pyhff2d567_0 conda-forge
pcre2 10.44 h3d7b363_2 conda-forge
peewee 3.17.7 py311h1eea93c_0 conda-forge
pillow 10.4.0 py311h5592be9_1 conda-forge
pint 0.21 pyhd8ed1ab_0 conda-forge
pip 24.3.1 pyh8b19718_0 conda-forge
platformdirs 4.3.6 pyhd8ed1ab_0 conda-forge
pox 0.3.5 pyhd8ed1ab_0 conda-forge
ppft 1.7.6.9 pyhd8ed1ab_0 conda-forge
prettytable 3.16.0 pyhd8ed1ab_0 conda-forge
proj 9.5.1 h4f671f6_0 conda-forge
psutil 6.1.0 py311he736701_0 conda-forge
pthread-stubs 0.4 hcd874cb_1001 conda-forge
pthreads-win32 2.9.1 h2466b09_4 conda-forge
py7zr 0.22.0 pyhd8ed1ab_0 conda-forge
pybcj 1.0.2 py311he736701_1 conda-forge
pycparser 2.22 pyhd8ed1ab_0 conda-forge
pycryptodomex 3.21.0 py311he736701_0 conda-forge
pydantic 2.9.2 pyhd8ed1ab_0 conda-forge
pydantic-core 2.23.4 py311h533ab2d_0 conda-forge
pydantic-settings 2.6.1 pyh3cfb1c2_0 conda-forge
pyecospold 4.0.0 py_0 cmutel
pypardiso 0.4.6 pyhd8ed1ab_0 conda-forge
pyparsing 3.2.0 pyhd8ed1ab_1 conda-forge
pyperclip 1.9.0 pyh7428d3b_1 conda-forge
pyppmd 1.1.0 py311hda3d55a_1 conda-forge
pyprind 2.11.2 py311h1ea47a8_1006 conda-forge
pyside2 5.15.15 py311h4238720_0 conda-forge
pysocks 1.7.1 pyh0701188_6 conda-forge
python 3.11.10 hce54a09_3_cpython conda-forge
python-dateutil 2.9.0 pyhd8ed1ab_0 conda-forge
python-dotenv 1.0.1 pyhd8ed1ab_0 conda-forge
python-json-logger 2.0.7 pyhd8ed1ab_0 conda-forge
python-tzdata 2024.2 pyhd8ed1ab_0 conda-forge
python_abi 3.11 5_cp311 conda-forge
pytz 2024.1 pyhd8ed1ab_0 conda-forge
pyxlsb 1.0.10 pyhd8ed1ab_0 conda-forge
pyyaml 6.0.2 py311h5082efb_2 conda-forge
pyzstd 0.16.2 py311h53056dc_0 conda-forge
qhull 2020.2 hc790b64_5 conda-forge
qt-main 5.15.15 h264fbc2_0 conda-forge
qt-webengine 5.15.15 h087ee03_1 conda-forge
rav1e 0.7.1 ha073cba_3 conda-forge
referencing 0.36.2 pyh29332c3_0 conda-forge
requests 2.32.3 pyhd8ed1ab_0 conda-forge
rfc3986 2.0.0 pyhd8ed1ab_1 conda-forge
rpds-py 0.27.1 py311hf51aa87_1 conda-forge
s3transfer 0.14.0 pyhd8ed1ab_0 conda-forge
salib 1.5.0 pyhd8ed1ab_0 conda-forge
scipy 1.14.1 py311hf16d85f_1 conda-forge
seaborn 0.13.2 hd8ed1ab_2 conda-forge
seaborn-base 0.13.2 pyhd8ed1ab_2 conda-forge
setuptools 75.3.0 pyhd8ed1ab_0 conda-forge
setuptools-scm 8.1.0 pyhd8ed1ab_0 conda-forge
shapely 2.0.7 py311hd54bd37_0 conda-forge
six 1.16.0 pyh6c4a22f_0 conda-forge
snappy 1.2.2 h7fa0ca8_0 conda-forge
sparse 0.17.0 pyhcf101f3_0 conda-forge
sqlalchemy 2.0.43 py311h3485c13_0 conda-forge
sqlite 3.47.0 h2466b09_1 conda-forge
stats_arrays 0.7 pyhd8ed1ab_0 conda-forge
statsmodels 0.14.4 py311h0a17f05_0 conda-forge
svt-av1 3.1.2 hac47afa_0 conda-forge
tableschema 1.21.0 pyhd8ed1ab_0 conda-forge
tabulate 0.9.0 pyhd8ed1ab_1 conda-forge
tabulator 1.53.5 pyhd8ed1ab_1 conda-forge
tbb 2021.13.0 hc790b64_0 conda-forge
texttable 1.7.0 pyhd8ed1ab_0 conda-forge
tk 8.6.13 h5226925_1 conda-forge
tomli 2.1.0 pyhff2d567_0 conda-forge
toolz 1.0.0 pyhd8ed1ab_1 conda-forge
tqdm 4.67.0 pyhd8ed1ab_0 conda-forge
types-python-dateutil 2.9.0.20241003 pyhff2d567_0 conda-forge
typing-extensions 4.12.2 hd8ed1ab_0 conda-forge
typing_extensions 4.12.2 pyha770c72_0 conda-forge
tzdata 2024b hc8b5060_0 conda-forge
ucrt 10.0.22621.0 h57928b3_1 conda-forge
unfold 2024.12.07 py_0 romainsacchi
unicodecsv 0.14.1 pyhd8ed1ab_2 conda-forge
unicodedata2 15.1.0 py311he736701_1 conda-forge
unidecode 1.3.8 pyhd8ed1ab_0 conda-forge
uriparser 0.9.8 h5a68840_0 conda-forge
urllib3 2.2.3 pyhd8ed1ab_0 conda-forge
vc 14.3 h8a93ad2_22 conda-forge
vc14_runtime 14.44.35208 h818238b_31 conda-forge
vcomp14 14.44.35208 h818238b_31 conda-forge
voluptuous 0.15.2 pyhd8ed1ab_1 conda-forge
vs2015_runtime 14.44.35208 h38c0c73_31 conda-forge
wcwidth 0.2.13 pyhd8ed1ab_1 conda-forge
werkzeug 3.1.3 pyhff2d567_0 conda-forge
wheel 0.45.0 pyhd8ed1ab_0 conda-forge
whoosh 2.7.4 py311h1ea47a8_9 conda-forge
win_inet_pton 1.1.0 pyh7428d3b_7 conda-forge
wrapt 1.16.0 py311he736701_1 conda-forge
wurst 0.4 pyhd8ed1ab_1 conda-forge
x265 3.5 h2d74725_3 conda-forge
xerces-c 3.2.5 he0c23c2_2 conda-forge
xlrd 2.0.1 pyhd8ed1ab_3 conda-forge
xlsxwriter 3.2.0 pyhd8ed1ab_0 conda-forge
xorg-libxau 1.0.11 hcd874cb_0 conda-forge
xorg-libxdmcp 1.1.3 hcd874cb_0 conda-forge
xz 5.2.6 h8d14728_0 conda-forge
yaml 0.2.5 h6a83c73_3 conda-forge
zipfile-deflate64 0.2.0 py311ha68e1ae_4 conda-forge
zipp 3.21.0 pyhd8ed1ab_0 conda-forge
zlib 1.3.1 h2466b09_2 conda-forge
zstandard 0.23.0 py311h53056dc_1 conda-forge
zstd 1.5.6 h0ea2cb4_0 conda-forge