Troubleshooting

Error related to llvmlite.dll

In Windows, it is possible that some examples crash with the error message:

OSError: Could not load shared object file: llvmlite.dll

If this problem is encountered, some possible solutions are given on this Numba issue on GitHub. An easy fix is to uninstall the packages llvmlite and numba, and reinstall them using the numba channel. Within the qtcad virtual environment, this can be done with:

conda uninstall llvmlite numba
conda install -c numba llvmlite
conda install -c numba numba

mach-o file, but is an incompatible architecture (have ‘x86_64’, need ‘arm64’)

If you see an error such as the following:

E   ImportError: dlopen(/opt/homebrew/Caskroom/miniconda/base/envs/qtcad/lib/python3.10/site-packages/fmm3dpy/hfmm3d_fortran.cpython-310-darwin.so, 0x0002):
 tried: '/opt/homebrew/Caskroom/miniconda/base/envs/qtcad/lib/python3.10/site-packages/fmm3dpy/hfmm3d_fortran.cpython-310-darwin.so'
  (mach-o file, but is an incompatible architecture (have 'x86_64', need 'arm64')),
   '/System/Volumes/Preboot/Cryptexes/OS/opt/homebrew/Caskroom/miniconda/base/envs/qtcad/lib/python3.10/site-packages/fmm3dpy/hfmm3d_fortran.cpython-310-darwin.so'
    (no such file), '/opt/homebrew/Caskroom/miniconda/base/envs/qtcad/lib/python3.10/site-packages/fmm3dpy/hfmm3d_fortran.cpython-310-darwin.so'
     (mach-o file, but is an incompatible architecture (have 'x86_64', need 'arm64'))

This is a known issue with the fmm3dpy package on Apple Silicon processors (e.g. Apple M1). As explained in Package installation with conda (recommended), please create a new conda environment in osx-64 mode with:

softwareupdate --install-rosetta
** RESTART YOUR SHELL **
CONDA_SUBDIR=osx-64 conda env create -f qtcad-mac.yml