Milenski
January 8, 2026, 3:26am
1
What’s happening with Discourse? When I try to load the admin page for an update, I get this error: “while trying to load /admin/docker/repos Error code: 500 error”.
I remember this happening when there was a new plugin implemented and it was also installed on the system. But now I don’t have any that I have installed, and I only use the implemented ones.
I completed:
cd /var/discourse
And everything went smoothly, but the same error occurs again for the update page in the admin panel.
I will also leave a backtrace from /logs here:
NameError (uninitialized constant Discourse::VERSION::PRE) app/controllers/application_controller.rb:440:in \`block in with_resolved_locale' app/controllers/application_controller.rb:440:in \`with_resol
plugins/docker_manager/app/controllers/docker_manager/admin_controller.rb:185:in \`discourse_upgrade_required?'
>
plugins/docker_manager/app/controllers/docker_manager/admin_controller.rb:67:in \`repos'
>
actionpack (8.0.4) lib/action_controller/metal/basic_implicit_render.rb:8:in \`send_action'
>
actionpack (8.0.4) lib/abstract_controller/base.rb:215:in \`process_action'
>
actionpack (8.0.4) lib/action_controller/metal/rendering.rb:193:in \`process_action'
>
actionpack (8.0.4) lib/abstract_controller/callbacks.rb:261:in \`block in process_action'
>
activesupport (8.0.4) lib/active_support/callbacks.rb:120:in \`block in run_callbacks'
>
app/controllers/application_controller.rb:440:in \`block in with_resolved_locale'
>
i18n (1.14.7) lib/i18n.rb:353:in \`with_locale'
>
app/controllers/application_controller.rb:440:in \`with_resolved_locale'
>
activesupport (8.0.4) lib/active_support/callbacks.rb:129:in \`block in run_callbacks'
>
app/controllers/application_controller.rb:1073:in \`ensure_dont_cache_page'
>
activesupport (8.0.4) lib/active_support/callbacks.rb:129:in \`block in run_callbacks'
>
activesupport (8.0.4) lib/active_support/callbacks.rb:140:in \`run_callbacks'
>
actionpack (8.0.4) lib/abstract_controller/callbacks.rb:260:in \`process_action'
>
actionpack (8.0.4) lib/action_controller/metal/rescue.rb:27:in \`process_action'
>
actionpack (8.0.4) lib/action_controller/metal/instrumentation.rb:76:in \`block in process_action'
>
activesupport (8.0.4) lib/active_support/notifications.rb:210:in \`block in instrument'
>
activesupport (8.0.4) lib/active_support/notifications/instrumenter.rb:58:in \`instrument'
>
activesupport (8.0.4) lib/active_support/notifications.rb:210:in \`instrument'
>
actionpack (8.0.4) lib/action_controller/metal/instrumentation.rb:75:in \`process_action'
>
actionpack (8.0.4) lib/action_controller/metal/params_wrapper.rb:259:in \`process_action'
>
activerecord (8.0.4) lib/active_record/railties/controller_runtime.rb:39:in \`process_action'
>
actionpack (8.0.4) lib/abstract_controller/base.rb:152:in \`process'
>
actionview (8.0.4) lib/action_view/rendering.rb:40:in \`process'
>
rack-mini-profiler (4.0.1) lib/mini_profiler/profiling_methods.rb:116:in \`block in profile_method'[ ](https://github.com/rack/rack/blob/master/mini_profiler/profiling_methods.rb#L116)
>
actionpack (8.0.4) lib/action_controller/metal.rb:252:in \`dispatch'
>
actionpack (8.0.4) lib/action_controller/metal.rb:335:in \`dispatch'
>
actionpack (8.0.4) lib/action_dispatch/routing/route_set.rb:67:in \`dispatch'
>
actionpack (8.0.4) lib/action_dispatch/routing/route_set.rb:50:in \`serve'
>
actionpack (8.0.4) lib/action_dispatch/routing/mapper.rb:32:in \`block in <class:Constraints>'
>
actionpack (8.0.4) lib/action_dispatch/routing/mapper.rb:62:in \`serve'
>
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:53:in \`block in serve'
>
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:133:in \`block in find_routes'
>
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:126:in \`each'
>
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:126:in \`find_routes'
>
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:34:in \`serve'
>
actionpack (8.0.4) lib/action_dispatch/routing/route_set.rb:908:in \`call'
>
railties (8.0.4) lib/rails/engine.rb:535:in \`call'
>
railties (8.0.4) lib/rails/railtie.rb:226:in \`public_send'
>
railties (8.0.4) lib/rails/railtie.rb:226:in \`method_missing'
>
actionpack (8.0.4) lib/action_dispatch/routing/mapper.rb:33:in \`block in <class:Constraints>'
>
actionpack (8.0.4) lib/action_dispatch/routing/mapper.rb:62:in \`serve'
>
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:53:in \`block in serve'
>
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:133:in \`block in find_routes'
>
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:126:in \`each'
>
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:126:in \`find_routes'
>
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:34:in \`serve'
>
actionpack (8.0.4) lib/action_dispatch/routing/route_set.rb:908:in \`call'
>
lib/middleware/omniauth_bypass_middleware.rb:35:in \`call'
>
lib/middleware/crawler_hooks.rb:11:in \`call'
>
rack (2.2.21) lib/rack/tempfile_reaper.rb:15:in \`call'
>
rack (2.2.21) lib/rack/conditional_get.rb:27:in \`call'
>
rack (2.2.21) lib/rack/head.rb:12:in \`call'
>
actionpack (8.0.4) lib/action_dispatch/http/permissions_policy.rb:38:in \`call'
>
lib/content_security_policy/middleware.rb:12:in \`call'
>
lib/middleware/anonymous_cache.rb:416:in \`call'
>
lib/middleware/csp_script_nonce_injector.rb:12:in \`call'
>
config/initializers/008-rack-cors.rb:14:in \`call'
>
rack (2.2.21) lib/rack/session/abstract/id.rb:266:in \`context'
>
rack (2.2.21) lib/rack/session/abstract/id.rb:260:in \`call'
>
actionpack (8.0.4) lib/action_dispatch/middleware/cookies.rb:706:in \`call'
>
actionpack (8.0.4) lib/action_dispatch/middleware/callbacks.rb:31:in \`block in call'
>
activesupport (8.0.4) lib/active_support/callbacks.rb:100:in \`run_callbacks'
>
actionpack (8.0.4) lib/action_dispatch/middleware/callbacks.rb:30:in \`call'
>
actionpack (8.0.4) lib/action_dispatch/middleware/debug_exceptions.rb:31:in \`call'
>
actionpack (8.0.4) lib/action_dispatch/middleware/show_exceptions.rb:32:in \`call'
>
logster (2.20.1) lib/logster/middleware/reporter.rb:40:in \`call'
>
lib/middleware/default_headers.rb:13:in \`call'
>
railties (8.0.4) lib/rails/rack/logger.rb:41:in \`call_app'
>
railties (8.0.4) lib/rails/rack/logger.rb:29:in \`call'
>
config/initializers/100-quiet_logger.rb:20:in \`call'
>
config/initializers/100-silence_logger.rb:29:in \`call'
>
actionpack (8.0.4) lib/action_dispatch/middleware/request_id.rb:34:in \`call'
>
lib/middleware/enforce_hostname.rb:23:in \`call'
>
rack (2.2.21) lib/rack/method_override.rb:24:in \`call'
>
actionpack (8.0.4) lib/action_dispatch/middleware/executor.rb:16:in \`call'
>
rack (2.2.21) lib/rack/sendfile.rb:127:in \`call'
>
rack-mini-profiler (4.0.1) lib/mini_profiler.rb:334:in \`call'
>
message_bus (4.4.1) lib/message_bus/rack/middleware.rb:60:in \`call'
>
lib/middleware/request_tracker.rb:321:in \`call'
>
actionpack (8.0.4) lib/action_dispatch/middleware/remote_ip.rb:96:in \`call'
>
lib/middleware/overload_protections.rb:22:in \`call'
>
lib/middleware/processing_request.rb:14:in \`call'
>
railties (8.0.4) lib/rails/engine.rb:535:in \`call'
>
railties (8.0.4) lib/rails/railtie.rb:226:in \`public_send'
>
railties (8.0.4) lib/rails/railtie.rb:226:in \`method_missing'
>
rack (2.2.21) lib/rack/urlmap.rb:74:in \`block in call'
>
rack (2.2.21) lib/rack/urlmap.rb:58:in \`each'
>
rack (2.2.21) lib/rack/urlmap.rb:58:in \`call'
>
unicorn (6.1.0) lib/unicorn/http_server.rb:634:in \`process_client'
>
unicorn (6.1.0) lib/unicorn/http_server.rb:739:in \`worker_loop'
>
unicorn (6.1.0) lib/unicorn/http_server.rb:547:in \`spawn_missing_workers'
>
unicorn (6.1.0) lib/unicorn/http_server.rb:143:in \`start'
>
unicorn (6.1.0) bin/unicorn:128:in \`<top (required)>'
>
vendor/bundle/ruby/3.3.0/bin/unicorn:25:in \`load'
>
vendor/bundle/ruby/3.3.0/bin/unicorn:25:in \`<main>'
I would be happy if someone knows something about the subject and can help.
2 Likes
david
January 8, 2026, 10:13am
2
Thanks for the reports. I have a fix in the pipeline:
main ← version-pre
merged 10:14AM - 08 Jan 26 UTC
This will always be `nil` under the new versioning scheme, so it was removed in … 723e872556efb90b9248ae0d69775acdaff3efe8. However, some plugins (including docker_manager) are checking the value of `::PRE`, so this was inadvertently a breaking change.
I’ll post again here once it’s available on latest
3 Likes
Same error here after installing updates today, rebuild didn’t help.
[default] NameError (uninitialized constant Discourse::VERSION::PRE) app/controllers/application_controller.rb:440:in `block in with_resolved_locale' app/controllers/application_controller.rb:440:in `
plugins/docker_manager/app/controllers/docker_manager/admin_controller.rb:185:in `discourse_upgrade_required?'
plugins/docker_manager/app/controllers/docker_manager/admin_controller.rb:67:in `repos'
actionpack (8.0.4) lib/action_controller/metal/basic_implicit_render.rb:8:in `send_action'
actionpack (8.0.4) lib/abstract_controller/base.rb:215:in `process_action'
actionpack (8.0.4) lib/action_controller/metal/rendering.rb:193:in `process_action'
actionpack (8.0.4) lib/abstract_controller/callbacks.rb:261:in `block in process_action'
activesupport (8.0.4) lib/active_support/callbacks.rb:120:in `block in run_callbacks'
app/controllers/application_controller.rb:440:in `block in with_resolved_locale'
i18n (1.14.7) lib/i18n.rb:353:in `with_locale'
app/controllers/application_controller.rb:440:in `with_resolved_locale'
activesupport (8.0.4) lib/active_support/callbacks.rb:129:in `block in run_callbacks'
app/controllers/application_controller.rb:1073:in `ensure_dont_cache_page'
activesupport (8.0.4) lib/active_support/callbacks.rb:129:in `block in run_callbacks'
activesupport (8.0.4) lib/active_support/callbacks.rb:140:in `run_callbacks'
actionpack (8.0.4) lib/abstract_controller/callbacks.rb:260:in `process_action'
actionpack (8.0.4) lib/action_controller/metal/rescue.rb:27:in `process_action'
actionpack (8.0.4) lib/action_controller/metal/instrumentation.rb:76:in `block in process_action'
activesupport (8.0.4) lib/active_support/notifications.rb:210:in `block in instrument'
activesupport (8.0.4) lib/active_support/notifications/instrumenter.rb:58:in `instrument'
activesupport (8.0.4) lib/active_support/notifications.rb:210:in `instrument'
actionpack (8.0.4) lib/action_controller/metal/instrumentation.rb:75:in `process_action'
actionpack (8.0.4) lib/action_controller/metal/params_wrapper.rb:259:in `process_action'
activerecord (8.0.4) lib/active_record/railties/controller_runtime.rb:39:in `process_action'
actionpack (8.0.4) lib/abstract_controller/base.rb:152:in `process'
actionview (8.0.4) lib/action_view/rendering.rb:40:in `process'
rack-mini-profiler (4.0.1) lib/mini_profiler/profiling_methods.rb:116:in `block in profile_method'
actionpack (8.0.4) lib/action_controller/metal.rb:252:in `dispatch'
actionpack (8.0.4) lib/action_controller/metal.rb:335:in `dispatch'
actionpack (8.0.4) lib/action_dispatch/routing/route_set.rb:67:in `dispatch'
actionpack (8.0.4) lib/action_dispatch/routing/route_set.rb:50:in `serve'
actionpack (8.0.4) lib/action_dispatch/routing/mapper.rb:32:in `block in <class:Constraints>'
actionpack (8.0.4) lib/action_dispatch/routing/mapper.rb:62:in `serve'
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:53:in `block in serve'
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:133:in `block in find_routes'
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:126:in `each'
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:126:in `find_routes'
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:34:in `serve'
actionpack (8.0.4) lib/action_dispatch/routing/route_set.rb:908:in `call'
railties (8.0.4) lib/rails/engine.rb:535:in `call'
railties (8.0.4) lib/rails/railtie.rb:226:in `public_send'
railties (8.0.4) lib/rails/railtie.rb:226:in `method_missing'
actionpack (8.0.4) lib/action_dispatch/routing/mapper.rb:33:in `block in <class:Constraints>'
actionpack (8.0.4) lib/action_dispatch/routing/mapper.rb:62:in `serve'
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:53:in `block in serve'
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:133:in `block in find_routes'
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:126:in `each'
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:126:in `find_routes'
actionpack (8.0.4) lib/action_dispatch/journey/router.rb:34:in `serve'
actionpack (8.0.4) lib/action_dispatch/routing/route_set.rb:908:in `call'
lib/middleware/omniauth_bypass_middleware.rb:35:in `call'
lib/middleware/crawler_hooks.rb:11:in `call'
rack (2.2.21) lib/rack/tempfile_reaper.rb:15:in `call'
rack (2.2.21) lib/rack/conditional_get.rb:27:in `call'
rack (2.2.21) lib/rack/head.rb:12:in `call'
actionpack (8.0.4) lib/action_dispatch/http/permissions_policy.rb:38:in `call'
lib/content_security_policy/middleware.rb:12:in `call'
lib/middleware/anonymous_cache.rb:416:in `call'
lib/middleware/csp_script_nonce_injector.rb:12:in `call'
config/initializers/008-rack-cors.rb:14:in `call'
rack (2.2.21) lib/rack/session/abstract/id.rb:266:in `context'
rack (2.2.21) lib/rack/session/abstract/id.rb:260:in `call'
actionpack (8.0.4) lib/action_dispatch/middleware/cookies.rb:706:in `call'
actionpack (8.0.4) lib/action_dispatch/middleware/callbacks.rb:31:in `block in call'
activesupport (8.0.4) lib/active_support/callbacks.rb:100:in `run_callbacks'
actionpack (8.0.4) lib/action_dispatch/middleware/callbacks.rb:30:in `call'
actionpack (8.0.4) lib/action_dispatch/middleware/debug_exceptions.rb:31:in `call'
actionpack (8.0.4) lib/action_dispatch/middleware/show_exceptions.rb:32:in `call'
logster (2.20.1) lib/logster/middleware/reporter.rb:40:in `call'
lib/middleware/default_headers.rb:13:in `call'
railties (8.0.4) lib/rails/rack/logger.rb:41:in `call_app'
railties (8.0.4) lib/rails/rack/logger.rb:29:in `call'
config/initializers/100-quiet_logger.rb:20:in `call'
config/initializers/100-silence_logger.rb:29:in `call'
actionpack (8.0.4) lib/action_dispatch/middleware/request_id.rb:34:in `call'
lib/middleware/enforce_hostname.rb:23:in `call'
rack (2.2.21) lib/rack/method_override.rb:24:in `call'
rack (2.2.21) lib/rack/sendfile.rb:127:in `call'
rack-mini-profiler (4.0.1) lib/mini_profiler.rb:334:in `call'
message_bus (4.4.1) lib/message_bus/rack/middleware.rb:60:in `call'
lib/middleware/request_tracker.rb:321:in `call'
actionpack (8.0.4) lib/action_dispatch/middleware/remote_ip.rb:96:in `call'
lib/middleware/overload_protections.rb:22:in `call'
lib/middleware/processing_request.rb:14:in `call'
rails_multisite (7.0.0) lib/rails_multisite/middleware.rb:26:in `call'
railties (8.0.4) lib/rails/engine.rb:535:in `call'
railties (8.0.4) lib/rails/railtie.rb:226:in `public_send'
railties (8.0.4) lib/rails/railtie.rb:226:in `method_missing'
rack (2.2.21) lib/rack/urlmap.rb:74:in `block in call'
rack (2.2.21) lib/rack/urlmap.rb:58:in `each'
rack (2.2.21) lib/rack/urlmap.rb:58:in `call'
unicorn (6.1.0) lib/unicorn/http_server.rb:634:in `process_client'
unicorn (6.1.0) lib/unicorn/http_server.rb:739:in `worker_loop'
unicorn (6.1.0) lib/unicorn/http_server.rb:547:in `spawn_missing_workers'
unicorn (6.1.0) lib/unicorn/http_server.rb:143:in `start'
unicorn (6.1.0) bin/unicorn:128:in `<top (required)>'
vendor/bundle/ruby/3.3.0/bin/unicorn:25:in `load'
vendor/bundle/ruby/3.3.0/bin/unicorn:25:in `<main>'
4 Likes
I am also experiencing this issue. Rebuilding twice did not solve the problem. Waiting for a fix.
david
January 8, 2026, 2:59pm
6
Sorry for the delay - we had a few unrelated problems with our CI today.
The fix is now live on latest, so updating again should resolve the issue. Please let us know if not.
1 Like
david
January 9, 2026, 10:54am
7
Milenski
January 9, 2026, 5:05am
14
I confirm, the problem is fixed. After a rebuild via the terminal everything is fine. Thank you.
david
January 9, 2026, 10:56am
15
I’ve split out the discussion about the failing migration into its own topic:
重新rebuild 失败了~日志如下：
discourse -c 'bundle exec rake db:migrate'
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled: (StandardError)
You must drop a column's default value before marking it as readonly
I, [2026-01-08T16:18:49.016491 #1] INFO -- : Terminating async processes
I, [2026-01-08T16:18:49.018961 #1] INFO -- : Sending INT to HOME=/var/lib/postgresql USER=postgres exec chpst -u postgres:postgres:ssl-cert -U postgres:postgres:ssl-cert /usr/lib/pos…
I’ll close this topic out, since we have confirmation that the ::PRE error is resolved. Thanks again for the reports!
1 Like
