# Problem Paraview/VTK

**URL:** https://discourse.paraview.org/t/problem-paraview-vtk/7518
**Category:** Web Support
**Created:** [June 30, 2021, 9:43am UTC](https://discourse.paraview.org/t/problem-paraview-vtk/7518 "2021-06-30T09:43:33Z")
**Posts on this page:** 9
**Page:** 1

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### Author: ![Luis\_Carlos\_Carneiro](https://discourse.paraview.org/user_avatar/discourse.paraview.org/luis_carlos_carneiro/32/5986_2.png) [@Luis\_Carlos\_Carneiro](https://discourse.paraview.org/u/Luis_Carlos_Carneiro)
#### Post date: [June 30, 2021, 9:43am UTC](https://discourse.paraview.org/t/problem-paraview-vtk/7518/1 "2021-06-30T09:43:33Z")

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Dear All,

When I run the example “web-project-templates-master” in Windows gives the following error:

```auto
C:\Users\Luis.Goncalves_ext\novo_botao>"C:\Program Files\ParaView 5.9.1-Windows-Python3.8-msvc2017-64bit\bin\pvpython" .\server\vtkpython\vtkw-server.py --content .\dist --port 1234
Traceback (most recent call last):
  File ".\server\vtkpython\vtkw-server.py", line 40, in <module>
    from wslink import server
  File "C:\Program Files\ParaView 5.9.1-Windows-Python3.8-msvc2017-64bit\bin\Lib\site-packages\wslink\server.py", line 16, in <module>
    from wslink import websocket as wsl
  File "C:\Program Files\ParaView 5.9.1-Windows-Python3.8-msvc2017-64bit\bin\Lib\site-packages\wslink\websocket.py", line 18, in <module>
    from autobahn.twisted.websocket import WebSocketServerFactory
  File "C:\Program Files\ParaView 5.9.1-Windows-Python3.8-msvc2017-64bit\bin\Lib\site-packages\autobahn\twisted\ __init__.py", line 54, in <module>
    from autobahn.twisted.wamp import ApplicationSession
  File "C:\Program Files\ParaView 5.9.1-Windows-Python3.8-msvc2017-64bit\bin\Lib\site-packages\autobahn\twisted\wamp.py", line 48, in <module>
    from autobahn.wamp import protocol, auth
  File "C:\Program Files\ParaView 5.9.1-Windows-Python3.8-msvc2017-64bit\bin\Lib\site-packages\autobahn\wamp\auth.py", line 40, in <module>
    from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
ModuleNotFoundError: No module named 'cryptography'

```

Can you please give a solution?

Thanks,

Luís Gonçalves

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<div class="post-metadata">

### Author: ![Luis\_Carlos\_Carneiro](https://discourse.paraview.org/user_avatar/discourse.paraview.org/luis_carlos_carneiro/32/5986_2.png) [@Luis\_Carlos\_Carneiro](https://discourse.paraview.org/u/Luis_Carlos_Carneiro)
#### Post date: [June 30, 2021, 9:44am UTC](https://discourse.paraview.org/t/problem-paraview-vtk/7518/2 "2021-06-30T09:44:21Z")

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From VTK Forum.

If I install Paraview 5.9.0 solves?

Which is the master? MPI version?

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [June 30, 2021, 9:44am UTC](https://discourse.paraview.org/t/problem-paraview-vtk/7518/3 "2021-06-30T09:44:42Z")

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Bug in paraview 5.9 release, use ParaView master.

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<div class="post-metadata">

### Author: ![Luis\_Carlos\_Carneiro](https://discourse.paraview.org/user_avatar/discourse.paraview.org/luis_carlos_carneiro/32/5986_2.png) [@Luis\_Carlos\_Carneiro](https://discourse.paraview.org/u/Luis_Carlos_Carneiro)
#### Post date: [June 30, 2021, 9:47am UTC](https://discourse.paraview.org/t/problem-paraview-vtk/7518/4 "2021-06-30T09:47:27Z")

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Which is the master? MPI version?

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<div class="post-metadata">

### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [June 30, 2021, 9:52am UTC](https://discourse.paraview.org/t/problem-paraview-vtk/7518/5 "2021-06-30T09:52:18Z")

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The simplest way for you would be to download the nightly release of ParaView, but it is not available right now. It should be in a few days.

You could also build the superbuild yourself:  
[https://gitlab.kitware.com/paraview/paraview-superbuild](https://gitlab.kitware.com/paraview/paraview-superbuild)

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<div class="post-metadata">

### Author: ![Luis\_Carlos\_Carneiro](https://discourse.paraview.org/user_avatar/discourse.paraview.org/luis_carlos_carneiro/32/5986_2.png) [@Luis\_Carlos\_Carneiro](https://discourse.paraview.org/u/Luis_Carlos_Carneiro)
#### Post date: [June 30, 2021, 10:26am UTC](https://discourse.paraview.org/t/problem-paraview-vtk/7518/6 "2021-06-30T10:26:37Z")

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The MPI version gives the same error.

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<div class="post-metadata">

### Author: ![Luis\_Carlos\_Carneiro](https://discourse.paraview.org/user_avatar/discourse.paraview.org/luis_carlos_carneiro/32/5986_2.png) [@Luis\_Carlos\_Carneiro](https://discourse.paraview.org/u/Luis_Carlos_Carneiro)
#### Post date: [June 30, 2021, 10:41am UTC](https://discourse.paraview.org/t/problem-paraview-vtk/7518/7 "2021-06-30T10:41:36Z")

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ParaView 5.9.0-RC2-Windows-Python3.8-msvc2017-64bit works?

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<div class="post-metadata">

### Author: ![Luis\_Carlos\_Carneiro](https://discourse.paraview.org/user_avatar/discourse.paraview.org/luis_carlos_carneiro/32/5986_2.png) [@Luis\_Carlos\_Carneiro](https://discourse.paraview.org/u/Luis_Carlos_Carneiro)
#### Post date: [June 30, 2021, 12:53pm UTC](https://discourse.paraview.org/t/problem-paraview-vtk/7518/8 "2021-06-30T12:53:24Z")

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> [@mwestphal](#):
>
> The simplest way for you would be to download the nightly release of ParaView, but it is not available right now. It should be in a few days.

How many days is few days?

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<div class="post-metadata">

### Author: ![wascott](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/w/8e8cbc/32.png) [@wascott](https://discourse.paraview.org/u/wascott)
#### Post date: [June 30, 2021, 5:30pm UTC](https://discourse.paraview.org/t/problem-paraview-vtk/7518/9 "2021-06-30T17:30:19Z")

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Luis,  
Lets say days, not weeks. Number is not determined, units are.