BIRSAx2
Hello,
I’m following this tutorial to setup tailwindcss with Phoenix. However when I run mix phx.server I keep getting this strange error:
[error] Task #PID<0.543.0> started from PetalSkeletonWeb.Endpoint terminating
** (stop) :eacces
erlang.erl:4412: :erlang.open_port({:spawn_executable, 'c:/Program Files/nodejs/npx.cmd'}, [{:cd, "d:/Code/Elixir/petal_skeleton/assets"}, :stderr_to_stdout, :use_stdio, :exit_status, :binary, :hide, {:args, ["tailwindcss", "--input=css/app.css", "--output=../priv/static/assets/app.css", "--postcss", "--watch"]}])
(elixir 1.12.3) lib/system.ex:1052: System.do_cmd/3
(phoenix 1.6.2) lib/phoenix/endpoint/watcher.ex:36: Phoenix.Endpoint.Watcher.watch/2
(elixir 1.12.3) lib/task/supervised.ex:90: Task.Supervised.invoke_mfa/2
(stdlib 3.15) proc_lib.erl:226: :proc_lib.init_p_do_apply/3
Function: &Phoenix.Endpoint.Watcher.watch/2
Args: ["npx", ["tailwindcss", "--input=css/app.css", "--output=../priv/static/assets/app.css", "--postcss", "--watch", {:cd, "d:/Code/Elixir/petal_skeleton/assets"}]]
[error] Task #PID<0.545.0> started from PetalSkeletonWeb.Endpoint terminating
Full log here ```mix phx.server log
I’ve trying to reinstall Elixir and node multiple times but nothing worked.
This other files might be helpful
dev.exs
mix.exs
package.json
postcss.config.js
tailwind.config.js
app.css
Where Next?
Trending in Questions
Other Trending Topics
Latest Phoenix Threads
Latest on Elixir Forum
Sponsor Spotlight
Producing high quality Elixir screencasts since 2017.
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #library
- #deployment
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #elixirconf
- #channels
- #exunit
- #discussion
- #code-sync
- #podcasts
- #javascript
- #onsite
- #dialyzer
- #docker
- #authentication
- #ai
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #blog-post
- #elixirconf-us
- #elixir-ls
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #processes
- #elixirconf-eu
- #api
- #forms
- #security
- #performance
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Error tracking, logs, uptime, and Just Enough APM. Built for developers.
Elixir, Erlang & BEAM conferences from Code Sync - join us in 2026!
Practical resources that improve the lives of professional developers.
Master modern tools, write cleaner code, and tackle real-world challenges.
**Building the future of software with AI, trust, and human connection.**
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"
Showing Posts 1 to 4- Show Best Posts
- Show All (oldest first)
- Show All (newest first)
Sebb
why do you have the npx watcher twice?
BIRSAx2
It’s just a copy-paste issue. I have only one watcher for npx
BIRSAx2
I don’t know exactly why but by renaming
C:\Program Files\nodejs\npm.cmdtoC:\Program Files\nodejs\npm.batandC:\Program Files\nodejs\npx.cmdtoC:\Program Files\nodejs\npx.batthe problem is solved.I guess it’s some weird node permissions issue on windows.
Sebb
If you are not forced to use windows on your dev-machine you should consider giving Linux or at least Mac a try.