I'm having issues in setting up my laravel project

Question

I got a new Laravel project but it showing the following error and it is not letting me run it using php artisan serve I tried using composer self-update too but it is not working....

php artisan serve

Here's the error =>

PHP Fatal error:  During inheritance of ArrayAccess: Uncaught ErrorException: Return type of Illuminate\Support\Collection::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Support\Collection.php:1349
Stack trace:
#0 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Support\Collection.php(11): Illuminate\Foundation\Bootstrap\HandleExceptions->handleError(8192, 'Return type of ...', 'C:\\xampp\\htdocs...', 1349)
#1 C:\xampp\htdocs\fitway\vendor\composer\ClassLoader.php(576): include('C:\\xampp\\htdocs...')
#2 C:\xampp\htdocs\fitway\vendor\composer\ClassLoader.php(427): Composer\Autoload\{closure}('C:\\xampp\\htdocs...')
#3 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Support\helpers.php(110): Composer\Autoload\ClassLoader->loadClass('Illuminate\\Supp...')#4 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\PackageManifest.php(130): collect(Array)
#5 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\PackageManifest.php(106): Illuminate\Foundation\PackageManifest->build()      
#6 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\PackageManifest.php(89): Illuminate\Foundation\PackageManifest->getManifest() 
#7 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\PackageManifest.php(78): Illuminate\Foundation\PackageManifest->config('aliases')
#8 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\Bootstrap\RegisterFacades.php(26): Illuminate\Foundation\PackageManifest->aliases()
#9 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\Application.php(230): Illuminate\Foundation\Bootstrap\RegisterFacades->bootstrap(Object(Illuminate\Foundation\Application))
#10 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\Console\Kernel.php(310): Illuminate\Foundation\Application->bootstrapWith(Array)
#11 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\Console\Kernel.php(127): Illuminate\Foundation\Console\Kernel->bootstrap()   
#12 C:\xampp\htdocs\fitway\artisan(37): Illuminate\Foundation\Console\Kernel->handle(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#13 {main} in C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Support\Collection.php on line 11

In Collection.php line 11:

  During inheritance of ArrayAccess: Uncaught ErrorException: Return type of Illuminate\Support\Collection::offsetExists($key) should either be compatib   
  le with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in   
   C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Support\Collection.php:1349                                                              
  Stack trace:                                                                                                                                             
  #0 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Support\Collection.php(11): Illuminate\Foundation\Bootstrap\HandleExceptions->handle   
  Error(8192, 'Return type of ...', 'C:\\xampp\\htdocs...', 1349)
  #1 C:\xampp\htdocs\fitway\vendor\composer\ClassLoader.php(576): include('C:\\xampp\\htdocs...')
  #2 C:\xampp\htdocs\fitway\vendor\composer\ClassLoader.php(427): Composer\Autoload\{closure}('C:\\xampp\\htdocs...')
  #3 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Support\helpers.php(110): Composer\Autoload\ClassLoader->loadClass('Illuminate\\Supp   
  ...')
  #4 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\PackageManifest.php(130): collect(Array)
  #5 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\PackageManifest.php(106): Illuminate\Foundation\PackageManifest->build()    
  #6 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\PackageManifest.php(89): Illuminate\Foundation\PackageManifest->getManife   
  st()
  #7 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\PackageManifest.php(78): Illuminate\Foundation\PackageManifest->config('a   
  liases')
  #8 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\Bootstrap\RegisterFacades.php(26): Illuminate\Foundation\PackageManifest-   
  >aliases()
  #9 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\Application.php(230): Illuminate\Foundation\Bootstrap\RegisterFacades->bo   
  otstrap(Object(Illuminate\Foundation\Application))
  #10 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\Console\Kernel.php(310): Illuminate\Foundation\Application->bootstrapWit   
  h(Array)
  #11 C:\xampp\htdocs\fitway\vendor\laravel\framework\src\Illuminate\Foundation\Console\Kernel.php(127): Illuminate\Foundation\Console\Kernel->bootstrap   
  ()
  #12 C:\xampp\htdocs\fitway\artisan(37): Illuminate\Foundation\Console\Kernel->handle(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony   
  \Component\Console\Output\ConsoleOutput))
  #13 {main}

Please tell me how can I resolve it.

I have tried changing the Php version in the .env file as well but it is not working either.

Chatgpt or Gemini have not been much of help either....