## Problem statement

Is the problem installation related? then `visit this page first <https://github.com/nortikin/sverchok#troubleshooting-installation-errors>`_.  

For any other issues, or if the installation still failed; Please describe the problem here.

## Steps to reproduce

1. 
2. 
3. 

## Expected result

What did you expect to see as a result of those steps?

## Actual result

What did you actually get?

## Sverchok version

This is especially important for installation-related issues. Please specify how do you install Sverchok: from sverchok-master.zip from github, or from release zip file, or from cloned git repo.
