I am trying to set up a new installation of CE 2 (whatever the latest version is as of 4 July 2018). Things have been going well until now. When I try to log in to the admin backend, it fails with the message "Visible section not found". Login was working fine all day yesterday.
Since I am completely new to Magento, I have no idea how to go about debugging this.
I see no errors or warnings in the system.log. There are no errors in the Apache error log. Clearing client and server caches seems to have no effect.
It would be nice if a useful error message were displayed, instead of the completely obscure "Visible section not found", but that is another issue. Anyway, what could this be???
Error msg coming from module-config/Model/Config/Structure.php
line no 215, maybe you don't have permission for tab?
hope it will help you.
throw new LocalizedException(__('Visible section not found.'));
comment this thing from Magento\Config\Model\Config\Structure and check it