CSS error when building assets

[ajakov]

After following the installation instructions found on this link: https://kunstmaanbundlescms.readthedocs.io/en/latest/installation/#installation-with-kunstmaancms-skeleton

I get this error when running npm run build

'cssOptimized' errored after 207 ms
[16:57:01] Error: Sass Error:
node_modules/bootstrap-sass/assets/stylesheets/bootstrap/_variables.scss
Error: Invalid CSS after "...     floor(math": expected expression (e.g. 1px, bold), was ".div($grid-gutter-w"
        on line 369 of node_modules/bootstrap-sass/assets/stylesheets/bootstrap/_variables.scss
        from line 10 of assets/ui/scss/config/vendors/_bootstrap-imports.scss
        from line 22 of assets/ui/scss/config/_config.scss
        from line 12 of assets/ui/scss/style.scss
>> vbar-padding-horizontal:        floor(math.div($grid-gutter-width, 2)) !defa
...

[acrobat]

Hi @ajakov, which version of node do you use? And is this an existing project or is it a new setup with 6.1? In the second case the installation script should produce a FE setup with node 16 in the .nvmrc and this installs correctly for me (nvm use && npm install && npm run build)

[FVKVN]

see: twbs/bootstrap-sass#1230
Limit bootstrap-sass to 3.4.1 to fix issues with the build …

[acrobat]

@ajakov the dependency version is updated in #3253 for newly generated projects, to fix it in existing projects you can copy the changes from that PR.