Upgrade to 3.2.1: Error in StylesheetUIAssetMerger.php

Hi
I did the one click upgrade and got this error, uninstalled listed plugins and vm restart also, i think the previous version was 3.1.0
After upgrade i get this error:

The following error just broke Piwik (v3.2.1):

variable @theme-color-header-text is undefined: failed at color: @theme-color-header-text !important; line: 1209
in

C:\inetpub\wwwroot\piwik\core\AssetManager\UIAssetMerger\StylesheetUIAssetMerger.php line 48

Before clearing cache i had this error:
An exception has been thrown during the rendering of a template (“variable @theme-color-header-text is undefined: failed at color: @theme-color-header-text !important; line: 1209”). in C:\inetpub\wwwroot\piwik\plugins\CoreHome\templates\getDefaultIndexView.twig 7 using PHP 5.6.30

Hi,

This variable should be set in plugins/Morpheus/stylesheets/theme.less. Can you try to replace the Piwik files with the latest ones to check if they got broken during the update?
https://piwik.org/docs/update/#the-manual-three-step-update

Thanks that helped!

before manual update checked the file and it had this line:
@theme-color-header-text: @color-white;