composer install giving error on autoload files

[batoolfatima2135]

hey,
i have cloned this repo but every time i run composer install it give this error i m unable to solve:

Generating optimized autoload files

Illuminate\Foundation\ComposerScripts::postAutoloadDump
@php artisan package:discover --ansi
PHP Parse error: syntax error, unexpected '|', expecting variable (T_VARIABLE) in C:\xampp\htdocs\sendportal\vendor\psr\log\src\LoggerInterface.php on line 30
PHP Fatal error: Exception thrown without a stack frame in Unknown on line 0
PHP Parse error: syntax error, unexpected '|', expecting variable (T_VARIABLE) in C:\xampp\htdocs\sendportal\vendor\psr\log\src\LoggerInterface.php on line 30
PHP Fatal error: Exception thrown without a stack frame in Unknown on line 0
Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 255

kindly guide me what im doing wrong, im using php 7.4 composer 2.2.6

here is screenshot of my error:

[Reayan-Iqbal]

@batoolfatima2135 Did you find any solution?