symfony/skeleton don't create env file but symfony/symfony-demo does

Question

Here's my problem :

When I try to create a symfony project with 'composer create-project symfony/skeleton project-name' (or website-skeleton) I got this error telling me I don't have .env-file

Executing script cache:clear [KO]
 [KO]
Script cache:clear returned with error code 255
!!
!!  Fatal error: Uncaught Symfony\Component\Dotenv\Exception\PathException: Unable to read the "C:\Users\Us\Desktop\Projects\newEra\newera-back/.env" environment file. in C:\Users\Us\Desktop\Projects\newEra\newera-back\vendor\symfony\dotenv\Dotenv.php:567
!!  Stack trace:
!!  #0 C:\Users\Us\Desktop\Projects\newEra\newera-back\vendor\symfony\dotenv\Dotenv.php(114): Symfony\Component\Dotenv\Dotenv->doLoad(false, Array)
!!  #1 C:\Users\Us\Desktop\Projects\newEra\newera-back\vendor\symfony\dotenv\Dotenv.php(157): Symfony\Component\Dotenv\Dotenv->loadEnv('C:\\Users\\Us\\...', 'APP_ENV', 'dev', Array, false)
!!  #2 C:\Users\Us\Desktop\Projects\newEra\newera-back\vendor\symfony\runtime\SymfonyRuntime.php(107): Symfony\Component\Dotenv\Dotenv->bootEnv('C:\\Users\\Us\\...', 'dev', Array, false)
!!  #3 C:\Users\Us\Desktop\Projects\newEra\newera-back\vendor\autoload_runtime.php(23): Symfony\Component\Runtime\SymfonyRuntime->__construct(Array)
!!  #4 C:\Users\Us\Desktop\Projects\newEra\newera-back\bin\console(11): require_once('C:\\Users\\Us in C:\Users\Us\Desktop\Projects\newEra\newera-back\vendor\symfony\dotenv\Dotenv.php on line 567
!!
Script @auto-scripts was called via post-update-cmd

But with symfony/symfony-demo the cache:clear works

Generating autoload files
composer/package-versions-deprecated: Generating version class...
composer/package-versions-deprecated: ...done generating version class

Run composer recipes at any time to see the status of your Symfony recipes.

Executing script cache:clear [OK]
Executing script assets:install public [OK]

PHP version

PHP 7.4.30 (cli) (built: Jun  7 2022 18:05:59) ( ZTS Visual C++ 2017 x86 )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies

Composer version

Composer version 1.8.0 2018-12-03 10:31:16

What could be the problem ?

Edit 1 : after going to php 8.1

Problem 1
    - symfony/flex v2.2.2 requires composer-plugin-api ^2.1 -> no matching package found.
    - symfony/flex v2.2.1 requires composer-plugin-api ^2.1 -> no matching package found.
    - symfony/flex v2.2.0 requires composer-plugin-api ^2.1 -> no matching package found.
    - symfony/flex v2.1.8 requires composer-plugin-api ^2.1 -> no matching package found.
    - symfony/flex v2.1.7 requires composer-plugin-api ^2.1 -> no matching package found.
    - symfony/flex v2.1.6 requires composer-plugin-api ^2.1 -> no matching package found.
    - symfony/flex v2.1.5 requires composer-plugin-api ^2.1 -> no matching package found.
    - symfony/flex v2.1.4 requires composer-plugin-api ^2.1 -> no matching package found.
    - symfony/flex v2.1.3 requires composer-plugin-api ^2.1 -> no matching package found.
    - symfony/flex v2.1.2 requires composer-plugin-api ^2.1 -> no matching package found.
    - symfony/flex v2.1.1 requires composer-plugin-api ^2.1 -> no matching package found.
    - symfony/flex v2.1.0 requires composer-plugin-api ^2.1 -> no matching package found.
    - symfony/flex v2.0.1 requires composer-plugin-api ^2.1 -> no matching package found.
    - symfony/flex v2.0.0 requires composer-plugin-api ^2.1 -> no matching package found.
    - Installation request for symfony/flex ^2 -> satisfiable by symfony/flex[v2.0.0, v2.0.1, v2.1.0, v2.1.1, v2.1.2, v2.1.3, v2.1.4, v2.1.5, v2.1.6, v2.1.7, v2.1.8, v2.2.0, v2.2.1, v2.2.2].

Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting
   see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details.
 - It's a private package and you forgot to add a custom repository to find it

I follow the tuto on getcomposer.org but when I do this command :

curl -sS https://getcomposer.org/installer | php -- --check

I get

All settings correct for using Composer

Answer 1

I had this problem too. I updated php to 8.1 and the problem was solved!