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How to fix «Element 'block', attribute 'class': [facet 'pattern'] The value '\Magento\Framework\View\Element\Template' is not accepted by the pattern `[A-Z][_a-zA-Z\d]*(\\[A-Z][_a-zA-Z\d]*)*`» after upgrading Magento to 2.2? (3)
How did I upgrade earosacoustic.com from Magento 2.0.2 to 2.2.2? (2)
How did I upgrade laurengadams.com from Magento 2.1.7 to 2.2.5? (2)
OrangeHill Article: How to fix the «Invalid Document» / «Element 'resource': The attribute 'title' is required but missing» failure in Magento to 2.2? (2)
How to fix «Element 'item': This element is not expected» after upgrading Magento to 2.2? (2)
How to fix «Element 'link', attribute 'href': The attribute 'href' is not allowed» / «The attribute 'src' is required but missing» after upgrading Magento to 2.2? (2)
Why are the product titles disappeared after upgrading a Blank-based design theme from Magento 2.0.x to 2.1.x? (2)
How to upgrade extensions? (1)
How to diagnose the «Cron script readiness check failed» failure during a Magento 2 upgrade? (1)
How to upgrade Magento 2? (1)
How can a developer upgrade a Magento 2 store to the latest version? (5)
How to disable the «Cron script readiness check» on a Magento 2 upgrade? (2)
How to fix «Invalid credentials for 'https://repo.magento.com/packages.json', aborting» (2)
How can a merchant upgrade a Magento 2 store to the latest version? (2)