Problem in importing tixi3wrapper

[99ciroc]

Hello everyone, I am experiencing a problem in loading tixi3 in my conda virtual environment. In particular, this is the error that i get, does anyone know how to solve this? I followed the procedure reported on Github for installation (conda install dlr-sc::tixi3):

from tixi3 import tixi3wrapper

File "C:\Users\CuozzoC\AppData\Local\anaconda3\envs\my_project_env\Lib\site-packages\tixi3\tixi3wrapper.py", line 173, in
class Tixi3(object):
Traceback (most recent call last):
File "C:\Users\CuozzoC\AppData\Local\anaconda3\envs\my_project_env\Lib\site-packages\tixi3\tixi3wrapper.py", line 183, in Tixi3
lib = ctypes.cdll.LoadLibrary(name)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\CuozzoC\AppData\Local\anaconda3\envs\my_project_env\Lib\ctypes_init_.py", line 454, in LoadLibrary
return self.dlltype(name)
^^^^^^^^^^^^^^^^^^^
File "C:\Users\CuozzoC\AppData\Local\anaconda3\envs\my_project_env\Lib\ctypes_init.py", line 366, in init
if '/' in name or '\' in name:
^^^^^^^^^^^
TypeError: argument of type 'NoneType' is not iterable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "c:\Users\CuozzoC\Desktop\Exaelia\CPACS_TAW\read_cpacs.py", line 7, in
from tixi3 import tixi3wrapper
File "C:\Users\CuozzoC\AppData\Local\anaconda3\envs\my_project_env\Lib\site-packages\tixi3\tixi3wrapper.py", line 173, in
class Tixi3(object):
File "C:\Users\CuozzoC\AppData\Local\anaconda3\envs\my_project_env\Lib\site-packages\tixi3\tixi3wrapper.py", line 189, in Tixi3
raise Exception("Could not load the tixi3 library. Please check if:\n" +
Exception: Could not load the tixi3 library. Please check if:

1. The PATH (Windows) / LD_LIBRARY_PATH (Linux) environment variable points to the library
2. The architecture of the library matches the architecture of python (a 32 bit python needs a 32 bit shared library)

I have checked that the PATH environment variable points to the library but I am still getting the error. I don't know if this can be useful, but when i run only "import tixi3" instead of "from tixi3 import tixi3wrapper" it works alright

[joergbrech]

Hi, thanks for opening an issue here! This error message typically means that there is some problem with opening the tixi3.dll library, which is installed in your conda environment. One reason could be that the PATH variable brings in additional incompatible dynamic libraries.

We have also encountered this issue when invoking a python script from some PyCharm instances.

Could you please provide more information?

1. What happen, when you open a conda terminal and run your python script directly, without PyCharm or any other IDE?
2. Could you please provide the output of conda list?

[99ciroc]

Thanks for the fast answer!

1. If i don't use any other IDE i don't get any errors (i use visual studio code)
2. This is the output of conda list:
   ca-certificates 2025.7.15 haa95532_0
   libffi 3.4.4 hd77b12b_1
   openssl 3.0.17 h35632f6_0
   pip 24.2 py38haa95532_0
   python 3.8.20 h8205438_0
   setuptools 75.1.0 py38haa95532_0
   sqlite 3.50.2 hda9a48d_1
   tixi3 3.3.0 py38h9d197f5_6 dlr-sc
   ucrt 10.0.22621.0 haa95532_0
   vc 14.3 h2df5915_10
   vc14_runtime 14.44.35208 h4927774_10
   vs2015_runtime 14.44.35208 ha6b5a95_10
   wheel 0.44.0 py38haa95532_0

[joergbrech]

Ok, so conda environment is fine then. Can you tell me how you run the python script from VSCode? Are you using any pyhon plugins or the VSCode console? We need to figure out which dlls are in the PATH variable used by VSCode to get an idea of where the conflict is coming from.

[joergbrech]

Another thing to try would be to use a newer python version. Python 3.8 has reached end-of-life last year. We provide conda packages for Python 3.9 - 3.12 currently.

[99ciroc]

My conda environment is selected from the bottom-right corner of VSCode, to run the code i just press the Run Python File in the top right corner, i don't have any plugins. In the PATH system variable i don't have a lot other than the default system paths, I also tried to create a new environment with Python 3.11 but i get the same error

[joergbrech]

Ok, I can recreate the issue in VSCode. As mentioned, this is already known for PyCharm. I will investivate. In the meantime, you would have to start your code from command line as a workaround.

[99ciroc]

Ok, thank you for your support, please let me know if you find a solution for VSCode, would be very useful!