wp-admin page now blank

I installed and activated this plug in last night. Once I logged out of my admin site, I could no longer log back in …the screen is now blank and I get this blank page http://kelvinharris.com/wp-login.php?redirect_to=http://www.kelvinharris.com/wp-admin%2F&reauth=1

Please help!

https://ww.wp.xz.cn/plugins/custom-login/