I thought the author’s problem was these errors, however it is not, his error seems to be something else. The error
[error] 812#0: *32 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined array key "v_nginx_cache_duration" in /usr/local/hestia/web/edit/web/index.php on line 352" while reading response header from upstream
Was in error permissions to the folder, in this post, my solution