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After downgrade magento 2.3.5-p1 to magento 2.3.4 getting error when setup upgrade command fire

An abstract factory could not create an instance of magentoframeworkappdeploymentconfig(alias: Magento\Framework\App\DeploymentConfig).
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  • There should be more informations in the Exception.log, can you post these as well. On another node: Magento isn't really build to downgrade. A lot of problems can occure.
    – CloudySi
    Commented May 6, 2020 at 12:38
  • not getting any error in Exception.log, Commented May 6, 2020 at 12:40
  • Hmm then try to debug it in vendor/laminas/laminas-servicemanager/src/ServiceManager.php in the method createFromAbstractFactory.
    – CloudySi
    Commented May 6, 2020 at 13:11
  • I am also getting this error after upgrading from magento v 2.2.6 to 2.3.5-p1. Commented May 27, 2020 at 19:08

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I'm sorry to say that Magento doesn't support to downgrade. However, if you still want to do it, you need to install Magento version 2.3.4, create a fresh site then migrate data from your old store to the new one.

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