Hi everyone, I have “AI embeddings semantic search” enabled on my site, but whenever I try to search something, I get a 500 Internal Server Error and no results are returned. Regular search works fine when I disable that setting. Here’s what I get in the browser console: static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e1781791509496:1 Failed to load resource: net::ERR_BLOCKED_BY_CLIENT app.js:365 ℹ️ Discourse v2026.7.0-latest — https://github.com/discourse/discourse/commits/9981e29915 — Ember v6.10.1 /discourse-ai/embeddings/semantic-search?q=asd:1 Failed to load resource: the server responded with a status of 500 () ajax.js:233 GET https://btt.community/discourse-ai/embeddings/semantic-search?q=discourse 500 (Internal Server Error) send @ jquery.js:9940 ajax @ jquery.js:9521 i @ ajax.js:233 $ @ ajax.js:252 performHyDESearch @ ai-full-page-search.gjs:228 onSearch @ ai-full-page-search.gjs:64 sendEvent @ cache-DtDz7X5V.js:471 trigger @ evented.js:68 search @ full-page-search.js:623 (anonymous) @ index.js:2534 $h @ ember-text-field.gjs:46 insertNewline @ ember-text-field.gjs:155 interpretKeyEvents @ ember-text-field.gjs:142 keyUp @ ember-text-field.gjs:177 _trigger @ core_view.js:75 superWrapper @ mandatory-setter-CXNsxygN.js:311 _trigger @ ember-events.js:138 superWrapper @ mandatory-setter-CXNsxygN.js:311 (anonymous) @ ember-events.js:199 I’ve attached a screenshot of the error as well. Has anyone run into this before, or does anyone know what might be causing it / what I should check on my end (settings, API keys, logs, etc.)? Any guidance would be appreciated. Thanks in advance! [image]

Looks like I just had to recreate the Embeddings configuration in my Discourse-AI admin settings for Gemini, and set the embedding dimensions to 3072. I’m guessing this config was created a while back, when the default was still 768. Thanks @nat for pointing me to check the logs!

Yes, I have. I configured a Gemini embeddings model in the AI settings page, and the Run test button completes successfully with a Success! result, as shown in the screenshot. So the embeddings model appears to be configured correctly. [image] I also have this error at the top I don’t know if its related. [{A260A143-3DC6-4BA9-8906-55B70837FF12}]

There’s likely more information in /logs also since 500-type errors go there. Can you check? The “Success!” only confirms the API credentials and endpoint work, but does not test the semantic search process.

Error ERROR: expected 768 dimensions, not 3072 querying embeddings for model gemini: Message (15 copies reported) Error ERROR: expected 768 dimensions, not 3072 querying embeddings for model gemini Backtrace /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activesupport-8.0.5/lib/active_support/broadcast_logger.rb:218:in 'block in ActiveSupport::BroadcastLogger#dispatch' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activesupport-8.0.5/lib/active_support/broadcast_logger.rb:217:in 'Array#map' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activesupport-8.0.5/lib/active_support/broadcast_logger.rb:217:in 'ActiveSupport::BroadcastLogger#dispatch' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activesupport-8.0.5/lib/active_support/broadcast_logger.rb:129:in 'ActiveSupport::BroadcastLogger#error' /var/www/discourse/plugins/discourse-ai/lib/embeddings/schema.rb:188:in 'DiscourseAi::Embeddings::Schema#asymmetric_similarity_search' /var/www/discourse/plugins/discourse-ai/lib/embeddings/semantic_search.rb:89:in 'DiscourseAi::Embeddings::SemanticSearch#search_for_topics' /var/www/discourse/plugins/discourse-ai/app/controllers/discourse_ai/embeddings/embeddings_controller.rb:70:in 'block in DiscourseAi::Embeddings::EmbeddingsController#search' /var/www/discourse/lib/hijack.rb:68:in 'BasicObject#instance_eval' /var/www/discourse/lib/hijack.rb:68:in 'block (2 levels) in Hijack#hijack' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/i18n-1.14.8/lib/i18n.rb:354:in 'I18n::Base#with_locale' /var/www/discourse/lib/hijack.rb:68:in 'block in Hijack#hijack' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/concurrent-ruby-1.3.7/lib/concurrent-ruby/concurrent/promises.rb:911:in 'Concurrent::Promises::Event#callback_on_resolution' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/concurrent-ruby-1.3.7/lib/concurrent-ruby/concurrent/promises.rb:797:in 'Concurrent::Promises::AbstractEventFuture#call_callback' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/concurrent-ruby-1.3.7/lib/concurrent-ruby/concurrent/promises.rb:803:in 'Concurrent::Promises::AbstractEventFuture#call_callbacks' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/concurrent-ruby-1.3.7/lib/concurrent-ruby/concurrent/promises.rb:692:in 'Concurrent::Promises::AbstractEventFuture#resolve_with' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/concurrent-ruby-1.3.7/lib/concurrent-ruby/concurrent/promises.rb:1325:in 'Concurrent::Promises::ResolvableEvent#resolve' /var/www/discourse/lib/scheduler/defer.rb:135:in 'block in Scheduler::Deferrable#do_work' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/rails_multisite-7.0.0/lib/rails_multisite/connection_management/null_instance.rb:49:in 'RailsMultisite::ConnectionManagement::NullInstance#with_connection' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/rails_multisite-7.0.0/lib/rails_multisite/connection_management.rb:17:in 'RailsMultisite::ConnectionManagement.with_connection' /var/www/discourse/lib/scheduler/defer.rb:130:in 'Scheduler::Deferrable#do_work' /var/www/discourse/lib/scheduler/defer.rb:116:in 'block (2 levels) in Scheduler::Deferrable#start_thread' Env HTTP HOSTS: censor Failed to process hijacked response correctly : DiscourseAi::Embeddings::Schema::MissingEmbeddingError : DiscourseAi::Embeddings::Schema::MissingEmbeddingError Message (15 copies reported) Failed to process hijacked response correctly : DiscourseAi::Embeddings::Schema::MissingEmbeddingError : DiscourseAi::Embeddings::Schema::MissingEmbeddingError Backtrace /var/www/discourse/plugins/discourse-ai/lib/embeddings/schema.rb:189:in 'DiscourseAi::Embeddings::Schema#asymmetric_similarity_search' /var/www/discourse/plugins/discourse-ai/lib/embeddings/semantic_search.rb:89:in 'DiscourseAi::Embeddings::SemanticSearch#search_for_topics' /var/www/discourse/plugins/discourse-ai/app/controllers/discourse_ai/embeddings/embeddings_controller.rb:70:in 'block in DiscourseAi::Embeddings::EmbeddingsController#search' /var/www/discourse/lib/hijack.rb:68:in 'BasicObject#instance_eval' /var/www/discourse/lib/hijack.rb:68:in 'block (2 levels) in Hijack#hijack' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/i18n-1.14.8/lib/i18n.rb:354:in 'I18n::Base#with_locale' /var/www/discourse/lib/hijack.rb:68:in 'block in Hijack#hijack' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/concurrent-ruby-1.3.7/lib/concurrent-ruby/concurrent/promises.rb:911:in 'Concurrent::Promises::Event#callback_on_resolution' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/concurrent-ruby-1.3.7/lib/concurrent-ruby/concurrent/promises.rb:797:in 'Concurrent::Promises::AbstractEventFuture#call_callback' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/concurrent-ruby-1.3.7/lib/concurrent-ruby/concurrent/promises.rb:803:in 'Concurrent::Promises::AbstractEventFuture#call_callbacks' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/concurrent-ruby-1.3.7/lib/concurrent-ruby/concurrent/promises.rb:692:in 'Concurrent::Promises::AbstractEventFuture#resolve_with' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/concurrent-ruby-1.3.7/lib/concurrent-ruby/concurrent/promises.rb:1325:in 'Concurrent::Promises::ResolvableEvent#resolve' /var/www/discourse/lib/scheduler/defer.rb:135:in 'block in Scheduler::Deferrable#do_work' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/rails_multisite-7.0.0/lib/rails_multisite/connection_management/null_instance.rb:49:in 'RailsMultisite::ConnectionManagement::NullInstance#with_connection' /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/rails_multisite-7.0.0/lib/rails_multisite/connection_management.rb:17:in 'RailsMultisite::ConnectionManagement.with_connection' /var/www/discourse/lib/scheduler/defer.rb:130:in 'Scheduler::Deferrable#do_work' /var/www/discourse/lib/scheduler/defer.rb:116:in 'block (2 levels) in Scheduler::Deferrable#start_thread' Env HTTP HOSTS: btt.community

AI Embeddings Semantic Search returns 500 error

Product Support Self-hosting

Falco (Falco) July 23, 2026, 3:59am 2

Have you setup an embeddings model on the AI settings page ?

Topic		Replies	Views
Semantic quick search gives error 500 Product Support ai , ai-search	1	488	April 5, 2024
Embeddings search still running error Bug ai , ai-search	9	223	November 11, 2026
Getting a lot of no results for semantic search Product Support ai , ai-search	20	885	March 13, 2025
All AI functions are working ok, but AI search gives 500 error Product Support ai	5	382	February 13, 2025
接口报错500 Product Support rest-api , ai	2	197	April 21, 2026

AI Embeddings Semantic Search returns 500 error

Related topics