I have a wordpress website hosted on Lightspeed server. There's an error message displaying in admin login page and I can't access wordpress backend. This is the error
Warning: Cannot modify header information - headers already sent by (output started at /tmp/session_f54bfef1a94d74c2534c8668c57bb987:33) in /home/website/public_html/wp-includes/pluggable.php on line 1173
What I see is that there's some kind of problem with a cached/minified file (?) located in tmp/ directory, and I don't have access on that directory. I cannot access this file and get more information about this issue.
What should I do to fix this? Any suggestions please?
Note. The pluggable.php file is ok, I checked it for white spaces and also replaced it with the original file I downloaded from wordpress.org, just to be sure that it's not corrupted.