# Unable to run VISAN -ModuleNotFoundError: No module named 'vtkCommonCorePython'
**URL:** https://forum.atmospherictoolbox.org/t/unable-to-run-visan-modulenotfounderror-no-module-named-vtkcommoncorepython/336
**Category:** VISAN
**Created:** [June 11, 2021, 4:48am UTC](https://forum.atmospherictoolbox.org/t/unable-to-run-visan-modulenotfounderror-no-module-named-vtkcommoncorepython/336 "2021-06-11T04:48:35Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@DM256](https://forum.atmospherictoolbox.org/u/DM256)
#### Post date: [June 11, 2021, 4:48am UTC](https://forum.atmospherictoolbox.org/t/unable-to-run-visan-modulenotfounderror-no-module-named-vtkcommoncorepython/336/1 "2021-06-11T04:48:35Z")
I’m trying to run Visan in a fresh Miniconda3 environment, only Visan is installed and the Python version is 3.7. Running on Ubuntu 20.04.
VTK will not import in Python with python3 -m vtk
The vtkCommonCorePython files seem to exist in my conda environment.
Any help would be appreciated. Thanks.
See below for error.
(py37) dan@Burke:~$ visan
Traceback (most recent call last):
File “/home/dan/miniconda3/envs/py37/lib/python3.7/site-packages/vtkmodules/vtkCommonCore.py”, line 5, in
from .vtkCommonCorePython import \*
ImportError: /home/dan/miniconda3/envs/py37/lib/python3.7/site-packages/vtkmodules/…/…/…/./libvtkCommonCore-8.2.so.1: undefined symbol: \_ZTIN3tbb4taskE
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File “”, line 1, in
File “/home/dan/miniconda3/envs/py37/lib/python3.7/site-packages/vtk.py”, line 32, in
all\_spec.loader.exec\_module(all\_m)
File “/home/dan/miniconda3/envs/py37/lib/python3.7/site-packages/vtkmodules/all.py”, line 7, in
from .vtkCommonCore import \*
File “/home/dan/miniconda3/envs/py37/lib/python3.7/site-packages/vtkmodules/vtkCommonCore.py”, line 9, in
from vtkCommonCorePython import \*
ModuleNotFoundError: No module named ‘vtkCommonCorePython’
Traceback (most recent call last):
File “/home/dan/miniconda3/envs/py37/lib/python3.7/site-packages/visan/app.py”, line 119, in OnInit
self.frame = VisanFrame(self, "VISAN " + VERSION, WindowHandler.GetNextPosition((800, 640)), (800, 640))
File “/home/dan/miniconda3/envs/py37/lib/python3.7/site-packages/visan/frame.py”, line 52, in **init**
self.shell = VisanShell(self)
File “/home/dan/miniconda3/envs/py37/lib/python3.7/site-packages/visan/shell.py”, line 41, in **init**
self.runStartupCommands(locals)
File “/home/dan/miniconda3/envs/py37/lib/python3.7/site-packages/visan/shell.py”, line 65, in runStartupCommands
“VTK %s” % interp.locals[‘vtk’].VTK\_VERSION,
KeyError: ‘vtk’
OnInit returned false, exiting…
(py37) dan@Burke:~$ conda install -c stcorp-forge vtkCommonCorePython
Collecting package metadata (current\_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
PackagesNotFoundError: The following packages are not available from current channels:
- vtkcommoncorepython
Current channels:
- [https://conda.anaconda.org/stcorp-forge/linux-64](https://conda.anaconda.org/stcorp-forge/linux-64)
- [https://conda.anaconda.org/stcorp-forge/noarch](https://conda.anaconda.org/stcorp-forge/noarch)
- [https://repo.anaconda.com/pkgs/main/linux-64](https://repo.anaconda.com/pkgs/main/linux-64)
- [https://repo.anaconda.com/pkgs/main/noarch](https://repo.anaconda.com/pkgs/main/noarch)
- [https://repo.anaconda.com/pkgs/r/linux-64](https://repo.anaconda.com/pkgs/r/linux-64)
- [https://repo.anaconda.com/pkgs/r/noarch](https://repo.anaconda.com/pkgs/r/noarch)
To search for alternate channels that may provide the conda package you’re
looking for, navigate to
```
https://anaconda.org
```
and use the search bar at the top of the page.
---
### Author:  [@sander.niemeijer](https://forum.atmospherictoolbox.org/u/sander.niemeijer)
#### Post date: [June 23, 2021, 7:44am UTC](https://forum.atmospherictoolbox.org/t/unable-to-run-visan-modulenotfounderror-no-module-named-vtkcommoncorepython/336/2 "2021-06-23T07:44:15Z")
We just released a new version of VISAN (4.2).
Can you please try again installing visan in a clean conda environment using `conda install -c stcorp-forge -c conda-forge visan`)?
Pay attention that this installs visan 4.2 (and not 4.1).
---
### Author:  [@DM256](https://forum.atmospherictoolbox.org/u/DM256)
#### Post date: [June 23, 2021, 8:14am UTC](https://forum.atmospherictoolbox.org/t/unable-to-run-visan-modulenotfounderror-no-module-named-vtkcommoncorepython/336/3 "2021-06-23T08:14:48Z")
It installs and runs, thanks! With one issue that to install 4.2 I needed to specify the version number.
```
conda install -c stcorp-forge -c conda-forge visan=4.2
```
