ModuleNotFoundError: No module named '_casadi'

[josephjschroeder]

Hi. I am frustrated by the above error, and would appreciate any insights.
Here is the backtrace, which is pretty much the same error I get when trying to debug from VS Code:

(ttc) C:\Accutils>python -i accutils_ttc.py
Traceback (most recent call last):
File "C:\Accutils\ttc\Lib\site-packages\casadi\casadi.py", line 18, in swig_import_helper
return importlib.import_module(mname)
~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^
File "C:\Program Files\Python313\Lib\importlib_init_.py", line 88, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "", line 1387, in _gcd_import
File "", line 1360, in _find_and_load
File "", line 1331, in _find_and_load_unlocked
File "", line 921, in _load_unlocked
File "", line 813, in module_from_spec
File "", line 1320, in create_module
File "", line 488, in _call_with_frames_removed
ImportError: DLL load failed while importing _casadi: The specified procedure could not be found.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "C:\Accutils\accutils_ttc.py", line 17, in
import cadquery as cq
File "C:\Accutils\ttc\Lib\site-packages\cadquery_init_.py", line 40, in
from .assembly import Assembly, Color, Constraint
File "C:\Accutils\ttc\Lib\site-packages\cadquery\assembly.py", line 22, in
from .occ_impl.solver import (
...<5 lines>...
)
File "C:\Accutils\ttc\Lib\site-packages\cadquery\occ_impl\solver.py", line 17, in
import casadi as ca
File "C:\Accutils\ttc\Lib\site-packages\casadi_init_.py", line 36, in
from casadi.casadi import *
File "C:\Accutils\ttc\Lib\site-packages\casadi\casadi.py", line 21, in
_casadi = swig_import_helper()
File "C:\Accutils\ttc\Lib\site-packages\casadi\casadi.py", line 20, in swig_import_helper
return importlib.import_module('casadi')
~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
File "C:\Program Files\Python313\Lib\importlib_init.py", line 88, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named '_casadi'

I have discovered that I can run my app by starting the python interpreter (3.13.2) like this:
"
(ttc) C:\Accutils>python
Python 3.13.2 (tags/v3.13.2:4f8bb39, Feb 4 2025, 15:23:48) [MSC v.1942 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.

import casadi
import cadquery
exec(open("accutils_ttc.py").read())
"
Any ideas?

Thanks,

Joe Schroeder