As in the title Logs: ``` ==> /var/log/gitlab/gitlab-rails/production.log <== Started GET "/group/project/settings/integrations" for 192.168.96.1 at 2020-02-03 17:00:16 +0000 Processing by Projects::Settings::IntegrationsController#show as HTML Parameters: {"namespace_id"=>"group", "project_id"=>"project"} Completed 500 Internal Server Error in 10ms (ActiveRecord: 1.4ms) ==> /var/log/gitlab/gitlab-rails/production_json.log <== {"method":"GET","path":"/group/project/settings/integrations","format":"html","controller":"Projects::Settings::IntegrationsController","action":"show","status":500,"error":"ActiveRecord::SubclassNotFound: The single-table inheritance mechanism failed to locate the subclass: 'GemnasiumService'. This error is raised because the column 'type' is reserved for storing the class in case of inheritance. Please rename this column if you didn't intend it to be used for storing the inheritance class or overwrite Service.inheritance_column to use another column for that information.","duration":11.01,"view":0.0,"db":1.41,"time":"2020-02-03T17:00:16.625Z","params": ==> /var/log/gitlab/gitlab-rails/production.log <== ActiveRecord::SubclassNotFound (The single-table inheritance mechanism failed to locate the subclass: 'GemnasiumService'. This error is raised because the column 'type' is reserved for storing the class in case of inheritance. Please rename this column if you didn't intend it to be used for storing the inheritance class or overwrite Service.inheritance_column to use another column for that information.): app/models/project.rb:895:in `find_service' app/models/project.rb:871:in `block in find_or_initialize_services' app/models/project.rb:864:in `map' app/models/project.rb:864:in `find_or_initialize_services' app/controllers/projects/settings/integrations_controller.rb:14:in `show' lib/gitlab/i18n.rb:47:in `with_locale' lib/gitlab/i18n.rb:53:in `with_user_locale' app/controllers/application_controller.rb:334:in `set_locale' lib/gitlab/middleware/multipart.rb:95:in `call' lib/gitlab/request_profiler/middleware.rb:14:in `call' lib/gitlab/middleware/go.rb:17:in `call' lib/gitlab/etag_caching/middleware.rb:11:in `call' lib/gitlab/middleware/read_only.rb:31:in `call' lib/gitlab/request_context.rb:18:in `call' lib/gitlab/metrics/requests_rack_middleware.rb:27:in `call' ``` Looks like there are couple of tables with `type` column, so we might be looking into > overwrite Service.inheritance_column to use another column ``` gitlabhq_production=# select t.table_schema, t.table_name from information_schema.tables t inner join information_schema.columns c on c.table_name = t.table_name and c.table_schema = t.table_schema where c.column_name = 'type' and t.table_schema not in ('information_schema', 'pg_catalog') and t.table_type = 'BASE TABLE' order by t.table_schema; table_schema | table_name --------------+-------------- public | audit_events public | ci_builds public | keys public | labels public | members public | namespaces public | notes public | services public | snippets public | web_hooks (10 rows) ``` Screenshot: