Error – "Sorry, but wrong access. Please go back"

I am getting this error when I try to login using social network.

I already tried deactivating all other plugins and Cloudflare, but the problems is still there.

Please help. 🙁

Image:
http://worldanimeclub.com/wp-content/uploads/2015/04/Screenshot_2.png

https://ww.wp.xz.cn/plugins/gianism/