I stumbled with this problem earlier. I've attached a screenshot below for your reference. If you have any ideas just let me know.
If I will run php bin/magento setup:upgrade it will show an error
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Seems the user you are using has no permission. Try logging in with Admin role user. If that also not remember you can get it from DB.
Go to your database and search for
In admin_user table find the admin user.
Reset the password field by selecting the function as MD5 form the drop-down in the function column.Now in the value field, type the password and hit Go.
Now try using admin credentials to login.