Step 2: Enable opcache.save_comments

  1. Open your OPcache configuration file in a text editor.

  2. Locate opcache.save_comments and uncomment it, if necessary.

  3. Make sure its value is set to 1.

  4. Save your changes and exit the text editor.

  5. Restart your web server:

    • Apache, Ubuntu: service apache2 restart
    • Apache, CentOS: service httpd restart
    • nginx, Ubuntu, and CentOS: service nginx restart
  6. Regenerate DI configuration and all missing classes that can be auto-generated:

    $ bin/magento setup:di:compile`
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