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Questions about developing custom modules

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Magento 2 : Invalid block type while creating custom grid in backend

Clipartcategories/Grid.php namespace Tomrain\Appcustomizer\Block\Adminhtml\Clipartcategories; class Grid extends \Magento\Backend\Block\Widget\Grid\Extended { /** * @var \Magento\Framework\Module … $backendHelper * @param \Tomrain\Appcustomizer\Model\ClipartcategoriesFactory $clipartcategoriesFactory * @param \Tomrain\Appcustomizer\Model\Status $status * @param \Magento\Framework\Module
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