How can I fix Fatal error after installing?

Q: After installing Mageplaza’s extension I’m encountering this error Fatal error: Uncaught TypeError: Argument 1 passed to Mageplaza\Core\Helper\AbstractData::__construct() must be an instance Could you show me a quick way to fix this?

A: Don’t worry, this is a common glitch that you might be faced unexpectly. Please follow this step:

• Removing folders: var/generation/* var/di/* var/cache/* by running the following command line at Magento root folder:

  rm -rf var/generation/* var/di/* var/cache/*
  

• Check the result.

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