Looking for an xample with jaspr_tailwind - can't make it run :(

[novas1r1]

Hello there,
I'm trying to rebuild my portfolio website using jaspr and I wanted to use tailwind. Unfortunately I cant make it run. I started with the basic jaspr template (content website) and followed the readme but I'm getting wild errors like:

"Running jaspr in static rendering mode.
[BUILDER] [ERROR] jaspr_tailwind:compiler on web/styles.tw.css:
[BUILDER] [ERROR] PathNotFoundException: Cannot open file, path = 'C:\Users\vry\AppData\Local\Temp\scratch_.
[BUILDER] [ERROR] , errno = 2)
[CLI] [ERROR] Failed building web assets. There is probably more output above.
[CLI] [ERROR] Could not start dev server due to build errors."

Is there any example project I can look into how this is correctly integrated?

I'm using the following versions:

name: jaspr_plain
description: A new Jaspr project
version: 0.0.1

environment:
  sdk: ">=3.8.0 <4.0.0"

dependencies:
  jaspr: ^0.21.3
  jaspr_router: ^0.7.3

dev_dependencies:
  build_runner: ^2.9.0
  jaspr_web_compilers: ^4.2.3+1
  jaspr_builder: ^0.21.3
  jaspr_lints: ^0.5.1
  jaspr_tailwind: ^0.3.4
  lints: ^6.0.0

jaspr:
  mode: static

Sorry, I'm a mobile developer - web dev is really not my strength >.<
Thanks in advance
Verry

[neoacevedo]

I can see this error happens too randomly. I can run jaspr serve in server mode, doing some styling changes in stiles.tw.css, when I run again, after a while the command jaspr serve it raises the error.

[dinko7]

Hi @novas1r1 @neoacevedo, thank you for reporting this issue. I had this problem in the past as well, but it comes and goes randomly. Scratch space issue is connected to the way codegen works, but I think I need to research this further.

Could both of you provide the following info:

• OS you are using - the more specific the better
• Dart version
• Tailwind version you installed

Additionally, if you have the repository with the issue publicly available, please post the link.

Last time I worked with Jaspr was more then 6 months ago, but I was able to run it with the latest version of jaspr_tailwind and jaspr 0.21.2. Maybe this is a new version issue, but I have not tried it yet.

For reference, I'm using tailwindcss v3.4.3 (you can get your version with tailwind -h in terminal).

[novas1r1]

Hey @dinko7,
thanks for getting back to us :)!

Here are my versions:

• Windows Version (Windows 11 or higher, 24H2, 2009)
• Dart SDK version: 3.9.2 (stable) (Wed Aug 27 03:49:40 2025 -0700) on "windows_x64"
• tailwindcss v4.1.14

I will check if I can make it run with your tailwind version - if not I will provide a link to the repo :)
Thanks for your help!
Verry

UPDATE:
I tried with tailwind 3.4.3 and I'm still getting the same error. Uploaded the repository here: https://github.com/novas1r1/jaspr_plain

Highly appreciate any help <3

[neoacevedo]

The mine:

• openSUSE Tumbleweed
• Dart 3.9.2
• tailwindcss 4.1.14

I think is more like the dart version and/or build_runner/build/build_modules packages the culprit than Jaspr itself.

[dinko7]

Hey @dinko7, thanks for getting back to us :)!

Here are my versions:

• Windows Version (Windows 11 or higher, 24H2, 2009)
• Dart SDK version: 3.9.2 (stable) (Wed Aug 27 03:49:40 2025 -0700) on "windows_x64"
• tailwindcss v4.1.14

I will check if I can make it run with your tailwind version - if not I will provide a link to the repo :) Thanks for your help! Verry

UPDATE: I tried with tailwind 3.4.3 and I'm still getting the same error. Uploaded the repository here: https://github.com/novas1r1/jaspr_plain

Highly appreciate any help <3

Hi @novas1r1, sorry for the late response. I was able to get this running by doing the following:

1. Change jaspr_web_compilers: ^4.2.3+1 to build_web_compilers: ^4.2.3+1
2. jaspr clean
3. jaspr build
4. jaspr serve

Can you please try this on your end to see if it resolve the issue for you as well or do I need to look further into the issue.

As a reference, here's my setup:

• MacOS 15.6.1
• tailwind 3.4.3
• Dart 3.8.1

[Tomucha]

FYI: same here:

tomucha@MacBook-Pro jaspr-pokus % jaspr serve 
Running jaspr in client rendering mode.
[BUILDER] [ERROR] jaspr_tailwind:compiler on web/styles.tw.css:
[BUILDER] [ERROR] PathNotFoundException: Cannot open file, path = '/private/var/folders/00/qjhtz0j53_jfx4crqdvwdmzw0000gn/T/scratch_spaceRwsgBY/web/styles.css' (
[CLI] [ERROR] Failed building web assets. There is probably more output above.
[CLI] [ERROR] Could not start dev server due to build errors.

tomucha@MacBook-Pro jaspr-pokus % dart --version      
Dart SDK version: 3.9.4 (stable) (Tue Sep 30 12:08:50 2025 -0700) on "macos_x64"
tomucha@MacBook-Pro jaspr-pokus % jaspr --version      
0.21.7
tomucha@MacBook-Pro jaspr-pokus % tailwindcss    
≈ tailwindcss v4.1.17

If anyone stumbles upon this issue, a simple workaround is to run tailwind in a separate terminal like this:
tailwindcss -i ./web/styles.tw.css -o ./web/styles.css --watch.

[lukehutch]

I submitted PR #14 that properly logs stderr output from tailwindcss, so that when jaspr_tailwind:compiler fails, you can see the real reason why (PathNotFoundException is a red herring).