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Magento admin not showing any messages

I found the issue that is Store -> Config -> System -> Security -> Max Session Size in Admin if I make this 0 then started working. I am not sure that it will impact on website admin panel ...
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Magento2 interface not found in Model class

I will be working on a while on magento 2 v2.3.4. Suddenly my admin panel is not working and shows the below error. Please help Interface 'Magento\Ui\Component\Form\Element\DataType\DataTypeInterface' ...
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Duplicate entry in DB after upgrading to 2.4.3

You can just use this script here Please read the explanations in the above url if it doesn't make sense for you as this ...
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Syntax error or access violation: 1071 Specified key was too long when running setup:upgrade

The limit for UTF8 is 767/3 = 255 characters, for UTF8m see reference here With this in mind, I'd ensure that these title fields are less that 255 together. How about changing from varchar(300) to ...

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