Class 'Composer\InstalledVersions' not found

Question

I am working on a laravel based project. Like everyday, I am trying to hit this command to run my project on server: php artisan serve But I am getting this error:

Class 'Composer\InstalledVersions' not found

I have tried below commands, but they don't seem to work:

composer update
composer update --no-scripts
php artisan optimize
composer dump-autoload
php composer.phar install --prefer-dist
php artisan package:discover --ansi

Answer 1

I also faced same issue when i'm trying to update my composer dependencies. use below commands to overcome this issue.

1. first you need to update composer version 2.0+

   it works fine after upgrading to Composer 2.0+. Maybe you are using an old version of 1.0+. 'Composer\InstalledVersions' is onl for the Composer 2.0+.

You can use sudo composer self-update --2 to update composer version make sure your composer changes not reflect to your other projects

now you should able to update composer using composer update.

hope this will helps you!!