mastodon インストール直後に502エラー

前提・実現したいこと

mastodonをインストールした直後にこのようなエラーが発生しました。
このスクリプトを実行しています。
Mastodon インスタンスをコマンド一発で建てる（Docker不使用、CentOS7.x@さくらVPS

発生している問題・エラーメッセージ

502　Bad　Gateway

pstream, client: **.**.**.**, server: ****.net, request: "GET /about HTTP/2.0", upstream: "http://127.0.0.1:3000/500.html", host: "****.net"

id
Nov 14 18:16:01 ****.net bundle[17434]: LEFT JOIN pg_collation c ON a.attcollation = c.oid AND a.attcollation <> t.typcollation
Nov 14 18:16:01 ****.net bundle[17434]: WHERE a.attrelid = '"accounts"'::regclass
Nov 14 18:16:01 ****.net bundle[17434]: AND a.attnum > 0 AND NOT a.attisdropped
Nov 14 18:16:01 ****.net bundle[17434]: ORDER BY a.attnum
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies/interlock.rb:47:in`permit_concurrent_loads'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/postgresql/database_statements.rb:62:in `block in query'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract_adapter.rb:581:in `block (2 levels) in log'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/.rbenv/versions/2.6.5/lib/ruby/2.6.0/monitor.rb:235:in `mon_synchronize'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract_adapter.rb:580:in `block in log'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/notifications/instrumenter.rb:23:in `instrument'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract_adapter.rb:571:in `log'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/postgresql/database_statements.rb:61:in `query'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:757:in `column_definitions'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract/schema_statements.rb:113:in `columns'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/schema_cache.rb:69:in `columns'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/schema_cache.rb:75:in `columns_hash'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/model_schema.rb:466:in `load_schema!'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/attributes.rb:234:in `load_schema!'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/attribute_decorators.rb:51:in `load_schema!'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/model_schema.rb:459:in `block in load_schema'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/.rbenv/versions/2.6.5/lib/ruby/2.6.0/monitor.rb:235:in `mon_synchronize'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/model_schema.rb:456:in `load_schema'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/model_schema.rb:346:in `attribute_types'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/model_schema.rb:370:in `type_for_attribute'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/table_metadata.rb:33:in `type'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/relation/predicate_builder.rb:51:in `build'
Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.3/lib/active_record/relation/predicate_builder.rb:112:in `block in expand_from_hash'

Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/app/models/account.rb:92:in `block in <class:Account>'

Nov 14 18:16:01 ****.net bundle[17434]: /home/mastodon/live/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/dependencies.rb:257:in `load_dependency'
 code=exited, status=1/FAILURE
Nov 14 18:16:46 ****.net systemd[1]: Unit mastodon-web.service entered failedstate.
Nov 14 18:16:46 ****.net systemd[1]: mastodon-web.service failed.
Nov 14 18:16:46 ****.net systemd[1]: mastodon-web.service holdoff time over, scheduling restart.
Nov 14 18:16:46 ****.net systemd[1]: Stopped mastodon-web.
-- Subject: Unit mastodon-web.service has finished shutting down

該当のソースコード

nginxのコンフィグです。

 Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;
events {
    worker_connections 1024;}
http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;

    server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        server_name  _;
        root         /usr/share/nginx/html;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

        location ^~ /.well-known/acme-challenge/ {}
        location / {
                return 301 https://$host$request_uri;
        }

        error_page 404 /404.html;
            location = /40x.html {
        }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }
    }

# Settings for a TLS enabled server.
#
#    server {
#        listen       443 ssl http2 default_server;
#        listen       [::]:443 ssl http2 default_server;
#        server_name  _;
#        root         /usr/share/nginx/html;
#
#        ssl_certificate "/etc/pki/nginx/server.crt";
#        ssl_certificate_key "/etc/pki/nginx/private/server.key";
#        ssl_session_cache shared:SSL:1m;
#        ssl_session_timeout  10m;
#        ssl_ciphers HIGH:!aNULL:!MD5;
#        ssl_prefer_server_ciphers on;
#
#        # Load configuration files for the default server block.
#        include /etc/nginx/default.d/*.conf;
#
#        location / {
#        }
#
#        error_page 404 /404.html;
#            location = /40x.html {
#        }
#
#        error_page 500 502 503 504 /50x.html;
#            location = /50x.html {
#        }
#    }

}