please help matters cookie error log.

Hello everyone, my site is now operating normally, but there are problems when logging error

“Erro: Cookies are blocked Due to unexpected output. For help, please see this documentation or try the suport forums.”

Right now I’m very worried because they have not figured out how to solve the problem. So people are looking forward to assist me in this matter..
Best Regards.
P/S : chi ti?t l?i t?i ??a chi tuyensinhcanuoc.com/adtuyensinh