Phoenix Server Not Starting

[sirfitzy]

Issue

Phoenix servers fail to launch on VSCode.

Hi everyone, any help would be much appreciated :)

I created a brand new phoenix app (https://github.com/SirFitz/new_app) and tried running with the VSCode extension, but the application never launches.
It stalls in the image below, which contains my config:

All details about the environment are below

Environment

• Elixir & Erlang versions (elixir --version): 1.12.3 (compiled with Erlang/OTP 24)
• Operating system: macOS 12.1
• Editor or IDE name (e.g. Emacs/VSCode): VSCode
• Editor Plugin/LSP Client name: ElixirLS: Elixir support and debugger

Troubleshooting

• Restart your editor (which will restart ElixirLS) sometimes fixes issues
• Stop your editor, remove the entire .elixir_ls directory, then restart your editor
  • NOTE: This will cause you to have to re-run the dialyzer build for your project

If you're experiencing high CPU usage, it is most likely Dialyzer building the PLTs; after it's done the CPU usage should go back to normal. You could also disable Dialyzer in the settings.

• Not experiencing high CPU Usage

Logs

1. If using a client other than VS Code, please try VSCode's "ElixirLS: Elixir support and debugger" extension. Does it reproduce your failure?

• I'm using ElixirLS: Elixir support and debugger v0.9.0

2. Create a new Mix project with mix new empty, then open that project with VS Code and open an Elixir file. Is your issue reproducible on the empty project? If not, please publish a repo on Github that does reproduce it.

• That app works, the issue is running apps Phoenix
• Here is a fresh phoenix repository that can be used to replicate the issue: https://github.com/SirFitz/new_app

3. Check the output log by opening View > Output and selecting "ElixirLS" in the dropdown. Please include any output that looks relevant. (If ElixirLS isn't in the dropdown, the server failed to launch.)

• No relevant Output, ElixirLS isn't in the dropdown

4. Check the developer console by opening Help > Toggle Developer Tools and include any errors that look relevant.

• No relevant errors in the console

[lukaszsamson]

Cannot reproduce

Most likely your launch config is invalid. Why are you starting apps? It's this is needed only for tests. Try with

{
      "type": "mix_task",
      "name": "phx.server",
      "request": "launch",
      "task": "phx.server",
      "projectDir": "${workspaceRoot}"
    }