Problem during installation of OMP

Hello dear all, I hope you are doing well.
I’m using PKP OMP : omp-3.3.0-8 and MAMP : 6.3.2 with PHP 8 or Xampp 8.0.10 and PHP 8 too.
It’s been a while since trying to install PKP OMP with MAMP and XAMPP on Macosx Big Sur, but I have either a 500 error or the following error:

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Warning: require_once (/Users/darnarel/Sites/localhost/omp/lib/pkp/lib/vendor/composer/autoload_real.php): Failed to open stream: No such file or directory in / Users / darnarel / Sites / localhost / omp / lib / pkp / lib / vendor / autoload.php on line 5

Fatal error: Uncaught Error: Failed opening required ‘/Users/darnarel/Sites/localhost/omp/lib/pkp/lib/vendor/composer/autoload_real.php’ (include_path = ‘.: / Applications / MAMP / bin / php / php8.0.0 / lib / php ‘) in /Users/darnarel/Sites/localhost/omp/lib/pkp/lib/vendor/autoload.php:5 ​​Stack trace: # 0 / Users / darnarel / Sites / localhost / omp / lib / pkp / classes / core / PKPApplication.inc.php (135): require_once () # 1 /Users/darnarel/Sites/localhost/omp/lib/pkp/includes/bootstrap.inc.php(41): PKPApplication- > __ construct () # 2 /Users/darnarel/Sites/localhost/omp/index.php(61): require (’/ Users / darnarel …’) # 3 {main} thrown in / Users / darnarel / Sites / localhost / omp / lib / pkp / lib / vendor / autoload.php on line 5.

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I am at your disposal for a solution.

Best regards

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