I just found the demo's CSS messed up.
Then I checked the deploy log and found this:
5:35:29 AM: ==== PROCESSING hugo-theme-meme ======
5:35:30 AM: Building site for theme hugo-theme-meme using default content to ../themeSite/static/theme/hugo-theme-meme/
5:35:30 AM: Error: Error building site: TOCSS: failed to transform "styles/main-rendered.scss" (text/x-scss): resource "scss/scss/main.scss_0437a1669ac8a9868f1dd1fe846b91a6" not found in file cache
5:35:30 AM: FAILED to create exampleSite for hugo-theme-meme
Note that hugo-theme-meme doesn't seem to be alone:

Looks like it's a problem with the latest version of Hugo (v0.67.1), as the previous deployment logs didn't have this error. But I'm not sure, because I didn't encounter this problem when testing my site locally.
Thanks for the heads up @reuixiy
I am very busy these days and after updating the Hugo version but I did not check the log.
Turns out that several themes broke due to Hugo 0.67.1
See: https://app.netlify.com/sites/hugothemes/deploys/5e6ec4da9b10ef00087b77a3
2:17:53 AM: Finished with 33 errors ...
Most errors are about SASS/SCSS resources not being found in the file cache.
I am reverting the change in the Hugo Themes repo and changing the title of this issue
cc/ @bep
This issue is also present in v0.68.0
Repo deployment will be using v0.67.0 for the time being.
cc: @digitalcraftsman
Hmm... I cannot reproduce this locally, but I will look into it...
I have reverted what I assume is the commit that caused this and triggered a theme build using Hugo master:
https://app.netlify.com/sites/hugothemes/deploys/5e765190fab06290ccdfbb03
Provided that works out OK, I will do a patch release tomorrow.
Sorry for the noise.
The latest deploy worked out fine.
7:47:02 PM: Finished with 2 errors ...
Thanks for looking into this.
@reuixiy
Your theme's demo is broken in v0.68.1 because you generated the theme resources with the recent Hugo versions that featured the commit that was reverted.
You need to regenerate and re-commit your theme's resources with v0.68.1
The demo will be fixed in the next scheduled update of the repository.
@onedrawingperday
Done.
Thanks a lot!
HI, experiencing the same error with 0.69.0 when trying to install Go and Hugo on ZEIT now via this script:
https://github.com/jamstatic/jamstatic-fr/blob/zeit/now-build.sh
Installing Hugo 0.69.0...
22:28:31.342
Hugo Static Site Generator v0.69.0-4205844B linux/amd64 BuildDate: 2020-04-10T09:12:34Z
22:28:31.729
Building site...
22:28:32.324
go: finding github.com/jygastaud/hugo-microtypo/microtypo v0.0.0-20191211154642-06fe4924e9e4
22:28:32.343
hugo: collected modules in 590 ms
22:28:33.401
Building sites … Total in 1649 ms
22:28:33.401
Error: Error building site: TOCSS: failed to transform "scss/main.scss" (text/x-scss): resource "scss/scss/main.scss_97926dd476e00bee4d471a0eb9d338c8" not found in file cache
22:28:33.406
Error: Command "./now-build.sh" exited with 255
build is working locally and on Netlify, I'm in unknown territory here, sorry it it's off-topic :)
@DirtyF
You need to call a Hugo Extended binary for your build to succeed.
It seems that the ZEIT platform uses the exact version from https://github.com/jamstatic/jamstatic-fr/blob/zeit/now.json whereas Netlify's default Xenial Build Image enforces the Hugo Extended binaries, hence the successful deployment on the latter.
If Hugo Basic is the only version you can use on ZEIT then you will have to generate the theme's resources locally with the Extended version and commit them in your project's repo.
Hello @onedrawingperday, thanks a lot for the anwser.
I switched to the extended version of Hugo, with the same results:
23:52:25.979 Installing Hugo 0.69.0...
23:52:27.869 Hugo Static Site Generator v0.69.0-4205844B/extended linux/amd64 BuildDate: 2020-04-10T09:16:58Z
23:52:27.977 Running Hugo...
23:52:28.602 hugo: collected modules in 602 ms
23:52:29.540 Building sites … Total in 1541 ms
23:52:29.541 Error: Error building site: POSTCSS: failed to transform "assets/css/main.css" (text/css): resource "scss/scss/main.scss_97926dd476e00bee4d471a0eb9d338c8" not found in file cache
@DirtyF
I’m not familiar with ZEIT maybe you need to ask them or ask in the Hugo forum at: https://discourse.gohugo.io
Most helpful comment
I have reverted what I assume is the commit that caused this and triggered a theme build using Hugo master:
https://app.netlify.com/sites/hugothemes/deploys/5e765190fab06290ccdfbb03
Provided that works out OK, I will do a patch release tomorrow.
Sorry for the noise.