Magento 2 : Plugin autoload error

Question

I have recently move a magento 2.2.5 website to a new server and now when I run an upgrade command or compile command I receive the below error. I have tried deleting any and every folder i can find for this plugin so that i could just reinstall it from scratch but have not had any luck.

I have

• deleted the table in the database that the plugin uses
• deleted the entry in the "integrations" table that referenced the plugin
• deleted all folders in app/code/mageplaza and lib/mageplaza
• edited composer.json to remove the link that referenced the plugin
• I tried to recompile redeploy with no luck?

Autoload error: Module 'Mageplaza_SocialLogin' from /var/www/html/.com/app/code/Mageplaza/SocialLogin' has been already defined in /var/www/html/.com/vendor/mageplaza/magento-2-social-login

I also removed it from the setup_table and now when I try to run the upgrade command

PHP Warning: require(/var/www/html/******.com/vendor/composer/../mageplaza/magento-2-social-login/registration.php): failed to open stream: No such file or directory in /var/www/html/******.com/vendor/composer/autoload_real.php on line 70

• Vivek Kumar: Please check edit, also if you edit your question to add additional info, you should mention edit heading.

Answer 1

You should delete entry for it in setup_module table, search for Mageplaza_SocialLogin and delete the corresponding entry.

Also if you find it's entry in app/etc/config.php , you should delete it from there as well.

Now run following commands ;

php bin/magento setup:upgrade
php bin/magento setup:static-content:deploy
chmod 777 -R var pub generate

EDIT:

Try running following command in your magento root ;

composer dump-autoload

• Felix H.: Running composer dumpautoload solved this autoload error.

Answer 2

This happened to me after accidentially duplicating my module to another place in app/code/.

Solution: Delete the duplicate.

Answer 3

look for that module in composer.lock and composer.json and delete it from both,
then launch composer install and bin/magento setup:upgrade