Usability issues & crash in species model mixture material handling -- was: pyfluent.networking ERROR: gRPC -fatal error // validate-expression-with-options:() #4986
Description
🔍 Before submitting the issue
- I have searched among the existing issues
- I am using a Python virtual environment
🐞 Description of the bug
Getting following error message when trying to setup a case in 26R1 with PyFluent:
`==============================================================================
Node 999999: Process 13744: Received signal SIGSEGV.
==============================================================================
pyfluent.networking ERROR: gRPC - fatal error: disconnected / ended abnormally, errorCode 1
Error in the fluent (fl) process : ended abnormally
Error: expr/get-expr-info:()
Error Object: #f
Error Object: ()
Error: %validate-expression-with-options:()
`
📝 Steps to reproduce
Try to execute attached Jupyter File along with the mesh file. Setup is interrupted as I wanted to debug another issue
Main error is probably: validate-expression-with-options:()
💻 Which operating system are you using?
Windows
📀 Which ANSYS version are you using?
26R1
🐍 Which Python version are you using?
3.10
📦 Installed packages
about-time==4.2.1
alive-progress==3.3.0
ansys-api-fluent==0.3.38
ansys-api-platform-instancemanagement==1.1.3
ansys-api-tools-filetransfer==0.2.0
ansys-fluent-core==0.38.0
ansys-fluent-parametric==0.10.0
ansys-fluent-visualization==0.25.1
ansys-fluidprops==0.7.0
ansys-platform-instancemanagement==1.1.2
ansys-tools-common==0.4.5
ansys-tools-filetransfer==0.2.2
ansys-units==0.10.1
anyio==4.12.1
argon2-cffi==25.1.0
argon2-cffi-bindings==25.1.0
arrow==1.4.0
asttokens==3.0.1
async-lru==2.2.0
attrs==25.4.0
babel==2.18.0
beartype==0.17.2
beautifulsoup4==4.14.3
bleach==6.3.0
certifi==2026.2.25
cffi==2.0.0
charset-normalizer==3.4.5
click==8.3.1
colorama==0.4.6
comm==0.2.3
contourpy==1.3.2
cycler==0.12.1
cyclopts==4.8.0
debugpy==1.8.20
decorator==5.2.1
defusedxml==0.7.1
Deprecated==1.3.1
docker==7.1.0
docstring_parser==0.17.0
docutils==0.22.4
exceptiongroup==1.3.1
executing==2.2.1
fastjsonschema==2.21.2
fonttools==4.62.0
fqdn==1.5.1
googleapis-common-protos==1.73.0
graphemeu==0.7.2
grpcio==1.78.0
grpcio-health-checking==1.78.0
grpcio-status==1.78.0
h11==0.16.0
h5py==3.16.0
httpcore==1.0.9
httpx==0.28.1
idna==3.11
importlib_metadata==8.7.1
ipykernel==7.2.0
ipython==8.38.0
ipywidgets==8.1.8
isoduration==20.11.0
jedi==0.19.2
Jinja2==3.1.6
joblib==1.5.3
json5==0.13.0
jsonpointer==3.0.0
jsonschema==4.26.0
jsonschema-specifications==2025.9.1
jupyter==1.1.1
jupyter-console==6.6.3
jupyter-events==0.12.0
jupyter-lsp==2.3.0
jupyter_client==8.8.0
jupyter_core==5.9.1
jupyter_server==2.17.0
jupyter_server_terminals==0.5.4
jupyterlab==4.5.5
jupyterlab_pygments==0.3.0
jupyterlab_server==2.28.0
jupyterlab_widgets==3.0.16
kiwisolver==1.5.0
lark==1.3.1
lxml==4.9.4
markdown-it-py==4.0.0
MarkupSafe==3.0.3
matplotlib==3.10.8
matplotlib-inline==0.2.1
mdurl==0.1.2
mistune==3.2.0
nbclient==0.10.4
nbconvert==7.17.0
nbformat==5.10.4
nest-asyncio==1.6.0
nltk==3.9.3
notebook==7.5.4
notebook_shim==0.2.4
numpy==1.26.4
overrides==7.7.0
packaging==26.0
pandas==1.5.3
pandocfilters==1.5.1
parso==0.8.6
pillow==12.1.1
platformdirs==3.11.0
pooch==1.9.0
prometheus_client==0.24.1
prompt_toolkit==3.0.52
protobuf==6.33.5
psutil==5.9.8
pure_eval==0.2.3
pycparser==3.0
Pygments==2.19.2
pyparsing==3.3.2
python-dateutil==2.9.0.post0
python-json-logger==4.0.0
pytz==2026.1.post1
pyvista==0.47.1
pywin32==311
pywinpty==3.0.3
PyYAML==6.0.3
pyzmq==27.1.0
referencing==0.37.0
regex==2026.2.28
requests==2.32.5
rfc3339-validator==0.1.4
rfc3986-validator==0.1.1
rfc3987-syntax==1.1.0
rich==14.3.3
rich-rst==1.3.2
rpds-py==0.30.0
scipy==1.15.3
scooby==0.11.0
Send2Trash==2.1.0
six==1.17.0
soupsieve==2.8.3
stack-data==0.6.3
terminado==0.18.1
tinycss2==1.4.0
tomli==2.4.0
tornado==6.5.4
tqdm==4.67.3
traitlets==5.14.3
typing_extensions==4.15.0
tzdata==2025.3
uri-template==1.3.0
urllib3==2.6.3
vcode==0.1.0
vtk==9.6.0
wcwidth==0.6.0
webcolors==25.10.0
webencodings==0.5.1
websocket-client==1.9.0
widgetsnbextension==4.0.15
wrapt==2.1.2
zipp==3.23.0