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Problem to enable module, Log: Plugin class ..\Name doesn't exist

Problem to enable module, Log: Plugin class ..\Name doesn't exist

Hi, there.

I'm trying to install this module.

magento/magento-2

 

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.

 

Thank you.