readthedocs.org: importation of compiled submodule failed (related to cython ?)

Details

Hi,

I have a problem with my documentation (my first published with doc, so I don’t really know if the problem comes from my configuration). sphinx-build is compiling fine on my computer, pip install works also fine in venv, and it seems to work fine on the readthedoc server too.

The functions can’t be documented because the module can’t be imported due to a compiled submodule that is not found … for unexplainable reasons: the compilation log shows that core.pyx is well compiled as core.c that is cell compiled into core-xxxx.so

• Read the Docs project URL: https://readthedocs.org/projects/pymadcad/
• Build URL (if applicable): https://readthedocs.org/api/v2/build/11589820.txt
• Read the Docs username (if applicable): jimy-byerley

Expected Result

documentation for the API functions: https://pymadcad.readthedocs.io/en/latest/reference/mesh.html

Actual Result

No function is found in the module, due to an ImportError, therefore, no content in the API documentation section

Is there something wrong in my configs ? Is there a known issue with this part of readthedoc ?