Phoenix Project not Compiling - (Mix) Could not find a Mix.Project

Phoenix Forum Questions / Help
, ,
1

Hello everyone, I created new project with mix phx.new projectName command but when its ask Fetch and install dependencies? [Yn] and I hit enter then it will get stuck, I have waited for hours, but it wont work, then when I break out of it and try to run mix deps.get then I will get this error (Mix) Could not find a Mix.Project, please ensure you are running Mix in a directory with a mix.exs file then when I run this cd projectName and then run mix deps.get then it will work, but if I tried to compile the project it will get stuck here
C:\Users\seyi\Desktop\EL\new>mix compile ==> file_system Compiling 7 files (.ex) Generated file_system app ==> decimal Compiling 4 files (.ex) Generated decimal app ==> mime Compiling 1 file (.ex) Generated mime app ==> nimble_options Compiling 3 files (.ex) Generated nimble_options app

Please am new to elixir I will really appriciate your help, Thanks

2

after the ph.new projectName, did you cd projectName into the folder? within your app folder is the place to run mix deps.get or mix compile

I also see you’re on windows, so this might differ a bit

3

Is that the full trace when you ran mix compile? There are no errors as far as I see. What happens if you run iex -S mix phx.server?

4 
$ iex -S mix phx.server
Erlang/OTP 26 [erts-14.0.2] [source] [64-bit] [smp:2:2] [ds:2:2:10] [async-threads:1] [jit:ns]

==> file_system
Compiling 7 files (.ex)
Generated file_system app
==> decimal
Compiling 4 files (.ex)
Generated decimal app
==> mime
Compiling 1 file (.ex)
Generated mime app
==> nimble_options
Compiling 3 files (.ex)
Generated nimble_options app

its get stuck right here without any error message

5

Yes I cd projectName into the folder and mix deps.get works but, Compiling didnt working Even if I try running the server

6

What version of Elixir and Erlang are you running?

7

Elixir 1.14.2 (compiled with Erlang/OTP 25)

8

Based on the log you posted above you’re running OTP 26:

$ iex -S mix phx.server
Erlang/OTP 26 [erts-14.0.2] [source] [64-bit] [smp:2:2] [ds:2:2:10] [async-threads:1] [jit:ns]

And Elixir 1.14 only supports OTP 26 if it 1.14.5 or later (and you’re using 1.14.2): Compatibility and Deprecations — Elixir v1.14.5

So I’d either upgrade elixir to 1.15 or downgrade Erlang/OTP to 25. I’d guess that upgrading Elixir is probably easier, although I haven’t tried using Elixir on Windows.

3 Likes
9

I just want to add that you should use snake_case (mix phx.new project_name) instead of camelCase (mix phx.new projectName) when generating your projects.

I’m not just saying that to be pedantic (although it does match the Elixir style guide…), but the project auto-generates a lot of stuff (e.g. when creating modules) and I could see some parser somewhere getting confused by the cases getting mixed up.

Out of curiosity, I tried generating the same project, and the module names work as expected (e.g. ProjectNameWeb) but some of the filenames are kinda wonky. Here’s the tree output of the lib/ directory:

├── projectName
│   ├── application.ex
│   ├── mailer.ex
│   └── repo.ex
├── projectName.ex
├── projectName_web
│   ├── components
│   │   ├── core_components.ex
│   │   ├── layouts
│   │   │   ├── app.html.heex
│   │   │   └── root.html.heex
│   │   └── layouts.ex
│   ├── controllers
│   │   ├── error_html.ex
│   │   ├── error_json.ex
│   │   ├── page_controller.ex
│   │   ├── page_html
│   │   │   └── home.html.heex
│   │   └── page_html.ex
│   ├── endpoint.ex
│   ├── gettext.ex
│   ├── router.ex
│   └── telemetry.ex
└── projectName_web.ex

Notice how the projectName_web module filename looks, ahem strange. This can be avoided by using snake_case when generating the projects (one less PITA to deal with, you know?).

2 Likes