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I did a new installation of Magento 2.4.2 (PHP 7.4.3). There were no errors during the installation. The ShopURL is running. The backend login also works. After I switched the backend to German, the following error message occurs:

"Exception #0 (Exception): Notice: Trying to access array offset on value of type null in /myPath2project/shop/vendor/magento/framework/View/Element/Html/Calendar.php on line 114"

Where could I start to solve the problem.

Thanks in advance Greetings heiko

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2 Answers 2

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I switched PHP to PHP 7.3.8 as a test. Now everything is working perfect. Then these specifications are only partially correct.

Magento System requirements

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I think issue is fully described here as well as solution. https://github.com/magento/magento2/issues/38214

Fix will be included in 2.4.8 which is to be released on 8 April 2025.

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