wp-includes/pluggable.php on line 1228 Blank Login

I was working on my website, and suddenly stop works. And when I try to go into my site againg, my wp-admin is blank and with this line:

Warning: Cannot modify header information – headers already sent by (output started at /home/content/10/8171510/html/takamura/wp-includes/comment.php:1) in /home/content/10/8171510/html/takamura/wp-includes/pluggable.php on line 1228

The problem now is 3 of my sites in the same hosting are with the same issue and I cand work on any of that. How can I resolve this? It’s any other way to access Worpress in my site? Please let me know, I have to finish this site for my client ASAP.

Thanks.