Libraries which containing the PHP class TemplateFile

Solve: PHP Fatal error: Uncaught Error: Class "TemplateFile" not found

DanBettles\Marigold\TemplateEngine\TemplateFile

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This class belongs to the vendor Danbettles and the package Marigold

Magento\Framework\View\Design\FileResolution\Fallback\TemplateFile

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This class belongs to the vendor Magetest and the package Magento