Hello ! 
This error 
comes up , probably due this package openbabel/openbabel: Open Babel is a chemical toolbox designed to speak the many languages of chemical data. (github.com)
Error Details (partly) while deploying the app
(Specklit/app2.py at main · avrabyt/Specklit · GitHub) (Partly)"]
Failed to build openbabel
Installing collected packages: webencodings, wcwidth, Send2Trash, pytz, ptyprocess, pickleshare, openbabel, mistune, ipython-genutils, fastjsonschema, commonmark, blinker, backcall, zipp, wheel, watchdog, urllib3, tzdata, typing-extensions, traitlets, tornado, toolz, tomlkit, toml, tinycss2, soupsieve, smmap, six, setuptools, semver, pyzmq, pyrsistent, pyparsing, pympler, pygments, pycparser, psutil, protobuf, prompt-toolkit, prometheus-client, pillow, pexpect, parso, pandocfilters, numpy, nest-asyncio, MarkupSafe, jupyterlab-widgets, jupyterlab-pygments, idna, entrypoints, defusedxml, decorator, debugpy, charset-normalizer, certifi, cachetools, backports.zoneinfo, attrs, validators, terminado, rich, requests, pytz-deprecation-shim, python-dateutil, pyarrow, packaging, matplotlib-inline, jupyter-core, jinja2, jedi, importlib-resources, importlib-metadata, gitdb, cffi, bleach, beautifulsoup4, tzlocal, pandas, jupyter-client, jsonschema, ipython, gitpython, deprecation, click, argon2-cffi-bindings, nbformat, jupyter-packaging, ipykernel, argon2-cffi, altair, nbclient, nbconvert, notebook, widgetsnbextension, ipywidgets, pydeck, ipyspeck, streamlit, st-speckmol
Running setup.py install for openbabel: started
Running setup.py install for openbabel: finished with status 'error'
error: subprocess-exited-with-error
× Running setup.py install for openbabel did not run successfully.
│ exit code: 1
╰─> [16 lines of output]
running install
/home/appuser/venv/lib/python3.7/site-packages/setuptools/command/install.py:37: SetuptoolsDeprecationWarning: setup.py install is deprecated. Use build and pip and other standards-based tools.
setuptools.SetuptoolsDeprecationWarning,
running build_ext
Warning: invalid version number '3.1.1.1'.
Guessing Open Babel location:
- include_dirs: ['/home/appuser/venv/include', '/usr/local/include/python3.7m', '/usr/local/include/openbabel3']
- library_dirs: ['/usr/local/lib', '/usr/local/lib']
building 'openbabel._openbabel' extension
swigging openbabel/openbabel-python.i to openbabel/openbabel-python_wrap.cpp
swig -python -c++ -small -O -templatereduce -naturalvar -I/home/appuser/venv/include -I/usr/local/include/python3.7m -I/usr/local/include/openbabel3 -o openbabel/openbabel-python_wrap.cpp openbabel/openbabel-python.i
Error: SWIG failed. Is Open Babel installed?
You may need to manually specify the location of Open Babel include and library directories. For example:
python setup.py build_ext -I/usr/local/include/openbabel3 -L/usr/local/lib
python setup.py install
[end of output]
note: This error originates from a subprocess, and is likely not a problem with pip.
error: legacy-install-failure
× Encountered error while trying to install package.
╰─> openbabel
note: This is an issue with the package mentioned above, not pip.
hint: See above for output from the failure.```
Here’s the link to the repository (requirements.txt file ) Specklit/requirements.txt at main · avrabyt/Specklit (github.com)
It will be of great help if any one point me out the correct way to add the package in the requirements.txt file (if that’s the error while deploying)
Thanks in advance! 
Cheers
Avra