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Fatal error: Uncaught Error: Class 'MagentoFrameworkComponentComponentRegistrar' not found

After Upgrading Magento 2.1.5 to 2.2.6 it’s give following error.
my magento source code is on subdirectory like www.mysite.com/staging/

/staging/vendor/mailchimp/mc-magento2/registration.php:12 Stack trace: #0

/staging/vendor/composer/autoload_real.php(71): require() #1

/staging/vendor/composer/autoload_real.php(61): composerRequiref4386a435c9f0af056695f7999d4c05d(‘62008ed0ff26c9a…’, ‘/var/www/vhosts…’) #2 #/staging/vendor/autoload.php(7): ComposerAutoloaderInitf4386a435c9f0af056695f7999d4c05d::getLoader() #3

/staging/app/autoload.php(30): include(‘/var/www/vhosts…’) #4

/staging/app/bootstrap.php(30): require_once(‘/var/www/vhosts…’) #5

staging/index.php(22): require(‘/var/www/vhosts…’) #6 {main} thrown in

/staging/vendor/mailchimp/mc-magento2/registration.php on line 12

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2

Answers


  1. 0

    I don’t know what exactly causes this, but composer install may help

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  2. 0

    As general rule I would delete the content of vendors directory and then

    If you are in your local dev:
    composer update

    If you are in some kind of production env where you only pull the repo:
    composer install

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