Error on going to login page after account verification by email

I’m getting an error upon going to login page after account verification by email.

The temporary page with the link to the signup is here.

Fatal error: Cannot redeclare login_header() (previously declared in /home/barbertime/public_html/wp-login.php:33) in /home/barbertime/public_html/wp-content/plugins/anti-splog/includes/blog-suspended-template.php on line 210

The verification question works well, and I get the email. When I follow the link (which I do on testing by copying it from the email and put it in the address bar) the verified pages shows up, but when I follow the link to login, I get this error (IE 11– I want to stay logged in as admin in Chrome.) Using Salient for a theme.

Any thoughts?