# While trying to load /admin/docker/repos Error code: 500 error

**URL:** https://meta.discourse.org/t/while-trying-to-load-admin-docker-repos-error-code-500-error/392939
**Category:** Bug
**Created:** [January 8, 2026, 3:26am UTC](https://meta.discourse.org/t/while-trying-to-load-admin-docker-repos-error-code-500-error/392939 "2026-01-08T03:26:09Z")
**Posts on this page:** 9
**Page:** 1

<div class="post-metadata">

### Author: ![Milenski](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/milenski/32/493345_2.png) [@Milenski](https://meta.discourse.org/u/Milenski)
#### Post date: [January 8, 2026, 3:26am UTC](https://meta.discourse.org/t/while-trying-to-load-admin-docker-repos-error-code-500-error/392939/1 "2026-01-08T03:26:09Z")

</div>

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  
./launcher rebuild app

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:

```plaintext
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. 🙃 😊 💙

---

<div class="post-metadata">

### Author: ![david](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/david/32/157490_2.png) [@david](https://meta.discourse.org/u/david)
#### Post date: [January 8, 2026, 10:13am UTC](https://meta.discourse.org/t/while-trying-to-load-admin-docker-repos-error-code-500-error/392939/2 "2026-01-08T10:13:58Z")

</div>

Thanks for the reports. I have a fix in the pipeline:

[https://github.com/discourse/discourse/pull/37006](https://github.com/discourse/discourse/pull/37006)

I’ll post again here once it’s available on `latest`

---

<div class="post-metadata">

### Author: ![bananaman](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/bananaman/32/493705_2.png) [@bananaman](https://meta.discourse.org/u/bananaman)
#### Post date: [January 8, 2026, 10:15am UTC](https://meta.discourse.org/t/while-trying-to-load-admin-docker-repos-error-code-500-error/392939/4 "2026-01-08T10:15:06Z")

</div>

Same error here after installing updates today, rebuild didn’t help.  
Updates installed fine yesterday and never saw this error before.

```plaintext
[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>'

```

---

<div class="post-metadata">

### Author: ![sniper756](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/sniper756/32/545002_2.png) [@sniper756](https://meta.discourse.org/u/sniper756)
#### Post date: [January 8, 2026, 2:21pm UTC](https://meta.discourse.org/t/while-trying-to-load-admin-docker-repos-error-code-500-error/392939/5 "2026-01-08T14:21:33Z")

</div>

I am also experiencing this issue. Rebuilding twice did not solve the problem. Waiting for a fix.

---

<div class="post-metadata">

### Author: ![david](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/david/32/157490_2.png) [@david](https://meta.discourse.org/u/david)
#### Post date: [January 8, 2026, 2:59pm UTC](https://meta.discourse.org/t/while-trying-to-load-admin-docker-repos-error-code-500-error/392939/6 "2026-01-08T14:59:28Z")

</div>

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.

---

<div class="post-metadata">

### Author: ![david](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/david/32/157490_2.png) [@david](https://meta.discourse.org/u/david)
#### Post date: [January 9, 2026, 10:54am UTC](https://meta.discourse.org/t/while-trying-to-load-admin-docker-repos-error-code-500-error/392939/7 "2026-01-09T10:54:58Z")

</div>

17 posts were split to a new topic: [Migration error in ‘rename\_discourse\_rewind\_disabled\_to\_enabled’](https://meta.discourse.org/t/migration-error-in-rename-discourse-rewind-disabled-to-enabled/393049)

---

<div class="post-metadata">

### Author: ![Milenski](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/milenski/32/493345_2.png) [@Milenski](https://meta.discourse.org/u/Milenski)
#### Post date: [January 9, 2026, 5:05am UTC](https://meta.discourse.org/t/while-trying-to-load-admin-docker-repos-error-code-500-error/392939/14 "2026-01-09T05:05:26Z")

</div>

I confirm, the problem is fixed. After a rebuild via the terminal everything is fine. Thank you. 💙

 ![image](https://global.discourse-cdn.com/meta/original/4X/8/6/4/864674d070699b5172d159842856e435c06b3d71.png)

---

<div class="post-metadata">

### Author: ![david](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/david/32/157490_2.png) [@david](https://meta.discourse.org/u/david)
#### Post date: [January 9, 2026, 10:56am UTC](https://meta.discourse.org/t/while-trying-to-load-admin-docker-repos-error-code-500-error/392939/15 "2026-01-09T10:56:07Z")

</div>

I’ve split out the discussion about the failing migration into its own topic:

> [@Migration error in 'rename\_discourse\_rewind\_disabled\_to\_enabled'](https://meta.discourse.org/t/migration-error-in-rename-discourse-rewind-disabled-to-enabled/393049):
>
> 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!

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### Author: ![david](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/david/32/157490_2.png) [@david](https://meta.discourse.org/u/david)
#### Post date: [January 9, 2026, 10:56am UTC](https://meta.discourse.org/t/while-trying-to-load-admin-docker-repos-error-code-500-error/392939/16 "2026-01-09T10:56:10Z")

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