To fix blank admin page on Magento 2.3 in Windows-10. This is the error what you will encounter when installing Magento 2.3 in Windows 10!

This error for the invalid template file is the difference between the use of “/” and “\” in the path. Windows uses “/” while Magento uses “\”.
The exception appear like this:
1 exception(s):
Exception #0 (Magento\Framework\Exception\ValidatorException): Invalid template file: ‘E:/xampp/htdocs/extendfeature/vendor/magento/module-backend/view/adminhtml/templates/page/js/require_js.phtml’ in module: ‘Magento_Backend’ block’s name: ‘require.js’
Open file vendor\magento\framework\View\Element\Template\File\Validator.php line no 138. Of find isPathInDirectories function in line 133
And change line 138 from
To
After make change find isPathInDirectories function like below code.
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