1

I'm trying to upgrade magento 2.2.2 to 2.3.0.

Php version 7.1.19(>7.1.3+)
i have run command :

...
composer update
php bin/magento cache:flush
php bin/magento setup:upgrade

======O/p=====

Module 'Magento_Variable':
Module 'Apptrian_ImageOptimizer':
Module 'Magento_Backend':
Module 'Magento_Config':
Module 'Customweb_Base':
Module 'Magento_Eav':
Module 'Magento_AdminNotification':
Module 'Magento_Indexer':
Running schema recurring...
Module 'Emipro_Custompayment':
Module 'Magento_Customer':
Module 'Magento_Cms':
Module 'Magento_Catalog':
Running schema recurring...
Module 'Magento_Quote':
Module 'Magento_Email':
Module 'Magento_Rule':
Module 'Magento_SalesSequence':
Running schema recurring...Unique constraint violation found
2

It seems this can help you to resolve your issue: Magento 2 Cannot create cache directory

Also, you can double check permissions for your project. It can be an issue with owner for ~/.composer or something like this.

  • that is a not problem,may be it conflicts with somr extension – Ketan Borada Jan 18 at 5:12

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