You removed Slogin component is not removed plugins. Plugins cause the component features that you have already removed. If you can not go to the admin panel components, connect via FTP delete a folder on your website /plugins/user/slogin.
The problem is that part of the code was removed from the Facebook plugin
Because of what your site does not ask for an email address from Facebook
I solved the problem by adding some of the code to \plugins\slogin_auth\facebook\facebook.php
= implode(, );
= . ;
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