Solution : Just logout from admin panel and login again. Cheers!!!Magento Admin: 404 Error Page not found.
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Let’s suppose you are logged in to Magento admin panel and you are installing a new extension that adds some new sections to Magento Configurations.
You activate your new extension and it adds some new tabs/sections but when you click on newly added tab you see a 404 error, don’t worry!
5 min read