Seafile server 6.2.0 beta is ready for testing!

Hmm… After fixing db-problem I get:
502 Bad Gateway

server {
listen 443 ssl http2;
listen [::]:443 ssl http2;
server_name seafile.mydomain.de;

ssl_protocols TLSv1.2;
ssl_ciphers 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA2$
ssl_prefer_server_ciphers On;

ssl_certificate /etc/letsencrypt/live/seafile.mydomain.de/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/seafile.mydomain.de/privkey.pem;
ssl_trusted_certificate /etc/letsencrypt/live/seafile.mydomain.de/chain.pem;

ssl_session_cache shared:SSL:128m;
add_header Strict-Transport-Security "max-age=31557600; includeSubDomains";
ssl_stapling on;
ssl_stapling_verify on;

add_header X-Content-Type-Options "nosniff" always;
add_header X-Frame-Options "DENY" always;
add_header X-Xss-Protection "1";

add_header Content-Security-Policy "default-src 'self' 'unsafe-inline' 'unsafe-eval' data: blob: https://co.mydomain.de";
add_header Referrer-Policy same-origin;

proxy_set_header X-Forwarded-For $remote_addr;

location / {
    proxy_pass         http://127.0.0.1:8000;
    proxy_set_header   Host $host;
    proxy_set_header   X-Real-IP $remote_addr;
    proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header   X-Forwarded-Host $server_name;
    proxy_read_timeout  1200s;
    proxy_http_version 1.1;

    client_max_body_size 0;

    access_log off;
    error_log /var/log/nginx/seahub.error.log error;
    fastcgi_read_timeout 36000;
}

location /seafhttp {
    rewrite ^/seafhttp(.*)$ $1 break;
    proxy_pass http://127.0.0.1:8082;
    client_max_body_size 0;
    proxy_connect_timeout  36000s;
    proxy_read_timeout  36000s;
    proxy_send_timeout  36000s;
    send_timeout  36000s;
    proxy_request_buffering off;
    proxy_http_version 1.1;
}

location /media {
    #root /blackhole/seafile/seafile-server-latest/seahub;
    root /home/seafile-service/seafile/seafile-server-latest/seahub;
}
}

Anyone could help please?