I wanted to install the German language packet from GitHub. https://github.com/mageplaza/magento-2-german-language-pack

Via composer I opened Putty and run first command line:

composer require mageplaza/magento-2-german-language-pack:dev-master

after this I wanted deploy via command:

php bin/magento setup:static-content:deploy de_DE -f

and now I see error: enter image description here

Page has stopped displaying: enter image description here

I have deleted module-core from vendor:

rm -rf vendor/mageplaza/module-core

and now error:

PHP Warning:  require(/home/fsg/domains/aron.pl/public_html/vendor/composer/../mageplaza/module-core/registration.php): failed to open stream: No such file or directory in /home/fsg/domains/aron.pl/public_html/vendor/composer/autoload_real.php on line 70
  • You can also add this as an answer and accept it later ... maybe this is helpfull for others too :) – sv3n Mar 12 '18 at 16:07

To solve this problem follow the steps below.

(depending on the version, it's called module-core or core-m2):

rm -rf vendor/mageplaza/core-m2 
rm -rf app/code/Mageplaza/Core
composer remove mageplaza/core-m2
composer dump-autoload
composer require mageplaza/module-core
php bin/magento setup:upgrade

*Before, connect to FTP and check module name on folder vendor/mageplaza/

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