Hugo starter error

I just start using hugo and
hugo server
give me this error:

Start building sites … 
ERROR 2020/09/28 20:19:48 render of "taxonomy" failed: execute of template failed: template: authors/terms.html:5:3: executing "authors/terms.html" at <partial "site_head" .>: error calling partial: "/tmp/hugo_cache/modules/filecache/modules/pkg/mod/github.com/wowchemy/wowchemy-hugo-modules/wowchemy@v0.0.0-20200902195927-86da39719ccd/layouts/partials/site_head.html:149:56": execute of template failed: template: partials/site_head.html:149:56: executing "partials/site_head.html" at <resources.Concat>: error calling Concat: resources in Concat must be of the same Media Type, got "text/x-scss" and "text/css"
ERROR 2020/09/28 20:19:48 render of "taxonomy" failed: execute of template failed: template: _default/list.html:5:3: executing "_default/list.html" at <partial "site_head" .>: error calling partial: "/tmp/hugo_cache/modules/filecache/modules/pkg/mod/github.com/wowchemy/wowchemy-hugo-modules/wowchemy@v0.0.0-20200902195927-86da39719ccd/layouts/partials/site_head.html:149:56": execute of template failed: template: partials/site_head.html:149:56: executing "partials/site_head.html" at <resources.Concat>: error calling Concat: resources in Concat must be of the same Media Type, got "text/x-scss" and "text/css"
ERROR 2020/09/28 20:19:48 render of "section" failed: execute of template failed: template: section/post.html:5:3: executing "section/post.html" at <partial "site_head" .>: error calling partial: "/tmp/hugo_cache/modules/filecache/modules/pkg/mod/github.com/wowchemy/wowchemy-hugo-modules/wowchemy@v0.0.0-20200902195927-86da39719ccd/layouts/partials/site_head.html:149:56": execute of template failed: template: partials/site_head.html:149:56: executing "partials/site_head.html" at <resources.Concat>: error calling Concat: resources in Concat must be of the same Media Type, got "text/x-scss" and "text/css"
ERROR 2020/09/28 20:19:48 render of "section" failed: execute of template failed: template: section/talk.html:5:3: executing "section/talk.html" at <partial "site_head" .>: error calling partial: "/tmp/hugo_cache/modules/filecache/modules/pkg/mod/github.com/wowchemy/wowchemy-hugo-modules/wowchemy@v0.0.0-20200902195927-86da39719ccd/layouts/partials/site_head.html:149:56": execute of template failed: template: partials/site_head.html:149:56: executing "partials/site_head.html" at <resources.Concat>: error calling Concat: resources in Concat must be of the same Media Type, got "text/x-scss" and "text/css"
ERROR 2020/09/28 20:19:48 failed to render pages: render of "home" failed: execute of template failed: template: index.html:5:3: executing "index.html" at <partial "site_head" .>: error calling partial: "/tmp/hugo_cache/modules/filecache/modules/pkg/mod/github.com/wowchemy/wowchemy-hugo-modules/wowchemy@v0.0.0-20200902195927-86da39719ccd/layouts/partials/site_head.html:149:56": execute of template failed: template: partials/site_head.html:149:56: executing "partials/site_head.html" at <resources.Concat>: error calling Concat: resources in Concat must be of the same Media Type, got "text/x-scss" and "text/css"
Built in 100 ms
Error: Error building site: TOCSS: failed to transform "main_parsed.scss" (text/x-scss): resource "scss/scss/main.scss_76ac6956597c32fec7ddf60d408db3ab" not found in file cache

I installed hugo using deb file on Ubunto 18.04.
thanks for any guide.

Hugo Static Site Generator v0.75.1-A4A7BAB7 linux/amd64 BuildDate: 2020-09-15T06:46:04Z

Hi and Welcome

you need to install and run Hugo Extended with this theme because this theme uses .SCSS

see …

Hope that helps

Thanks, I installed hugo extended and also Go using:

sudo snap install --classic --channel=1.11/stable go 

output error:

hugo server
Error: we found a go.mod file in your project, but you need to install Go to use it. See https://golang.org/dl/.: module "github.com/wowchemy/wowchemy-hugo-modules/wowchemy" not found; either add it as a Hugo Module or store it in "/home/abolfazl/git/WEB/ziaeemehr/themes".: module does not exist
 ziaeemehr git:(master) go version
go version go1.15.2 linux/amd64

I also found this answer that snap installation has problem.