DLL Load failed when importing PyStan on Windows

Question

I am trying to import PyStan in Windows 10, but I keep getting the following error:

Traceback (most recent call last):
import pystan
File "C:\Users\User\AppData\Local\Continuum\Anaconda2\envs\test\lib\site-packages\pystan\__init__.py", line 9, in <module>
  from pystan.api import stanc, stan
File "C:\Users\User\AppData\Local\Continuum\Anaconda2\envs\test\lib\site-packages\pystan\api.py", line 14, in <module>
  import pystan._api  # stanc wrapper
ImportError: DLL load failed: The specified module could not be found.

I have uninstalled PyStan and reinstalled with Pip, but I seem to be getting the same error. I use the following Python version:

Python 3.5.6 |Anaconda, Inc.| (default, Aug 26 2018, 16:05:27) [MSC v.1900 64 bit (AMD64)] on win32

I also get the same error when I am not working in a virtual environment.

Thanks in advance.

Forbear

According to their documentation pyStan is partially supported on Windows. However, do you have multiple instances of Anaconda installed on your system? couldn't help but notice the folder name Anaconda2 – Dorella

@Dorella I only have one Anaconda version installed, which is 2, hence the folder name. – Forbear

i tried installing it in a virtual environment on Python 3.7 64-bit and got the same error, the package seems to be broken. – Dorella

It seems like indeed, this is a Windows problem, because I just installed it on Ubuntu 16 without any problems. – Forbear

This answer might help you. https://mcmap.net/q/1094506/-import-pystan-_api-failed-importerror-dll-load-failed-the-specified-module-could-not-be-found – Expendable