I'm trying to install this module.
I download from github, put in app/code/MagentoJapan, enable this module, and upgrade.
But it's show below log.
main.ERROR:Plugin class Magento\JapaneseAddress\Plugin\Customer\Model\Name doesn't exist
main.CRITICAL: Plugin class Magento\CurrencyPrecision\Plugin\Directory\Model\CurrencyPrecisionFormatting doesn't exist  
main.CRITICAL: Plugin class Magento\JapaneseName\Plugin\Framework\Data\ExtensionAttributesValues doesn't exist  
Environment・magento 2.3.0(update from 2.2.7 by composer)・php7.2
I don't know what's wrong.Please tell me what should I do.