If you try to add and save an image inside the Trix editor, you might run into this error:
09:47:11 web.1 | LoadError (Generating image variants require the image_processing gem. Please add `gem 'image_processing', '~> 1.2'` to your Gemfile.):
The first (obvious) thing to check is if you have installed the image_processing gem.
If you haven't, then install it by running:
bundle add image_processing
Then restart the Rails server and the error should be fixed. Restarting the Rails server can also fix the error if you already had the gem installed but still got the error.
The full error stack trace looks like this:
09:47:11 web.1 | LoadError (Generating image variants require the image_processing gem. Please add `gem 'image_processing', '~> 1.2'` to your Gemfile.): 09:47:11 web.1 | 09:47:11 web.1 | activestorage (7.1.3) lib/active_storage/transformers/image_processing_transformer.rb:6:in `rescue in <main>' 09:47:11 web.1 | activestorage (7.1.3) lib/active_storage/transformers/image_processing_transformer.rb:3:in `<main>' 09:47:11 web.1 | bootsnap (1.13.0) lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require' 09:47:11 web.1 | bootsnap (1.13.0) lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require' 09:47:11 web.1 | zeitwerk (2.6.12) lib/zeitwerk/kernel.rb:38:in `require' 09:47:11 web.1 | activestorage (7.1.3) app/models/active_storage/variation.rb:85:in `transformer' 09:47:11 web.1 | activestorage (7.1.3) app/models/active_storage/variation.rb:58:in `block in transform' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/notifications.rb:206:in `block in instrument' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/notifications/instrumenter.rb:58:in `instrument' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/notifications.rb:206:in `instrument' 09:47:11 web.1 | activestorage (7.1.3) app/models/active_storage/variation.rb:57:in `transform' 09:47:11 web.1 | activestorage (7.1.3) app/models/active_storage/variant_with_record.rb:49:in `block in transform_blob' 09:47:11 web.1 | activestorage (7.1.3) lib/active_storage/downloader.rb:15:in `block in open' 09:47:11 web.1 | activestorage (7.1.3) lib/active_storage/downloader.rb:24:in `open_tempfile' 09:47:11 web.1 | activestorage (7.1.3) lib/active_storage/downloader.rb:12:in `open' 09:47:11 web.1 | activestorage (7.1.3) lib/active_storage/service.rb:92:in `open' 09:47:11 web.1 | activestorage (7.1.3) app/models/active_storage/blob.rb:290:in `open' 09:47:11 web.1 | activestorage (7.1.3) app/models/active_storage/variant_with_record.rb:48:in `transform_blob' 09:47:11 web.1 | activestorage (7.1.3) app/models/active_storage/variant_with_record.rb:44:in `process' 09:47:11 web.1 | activestorage (7.1.3) app/models/active_storage/variant_with_record.rb:19:in `processed' 09:47:11 web.1 | activestorage (7.1.3) app/controllers/active_storage/representations/base_controller.rb:14:in `set_representation' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/callbacks.rb:403:in `block in make_lambda' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/callbacks.rb:202:in `block (2 levels) in halting' 09:47:11 web.1 | actionpack (7.1.3) lib/abstract_controller/callbacks.rb:34:in `block (2 levels) in <module:Callbacks>' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/callbacks.rb:203:in `block in halting' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/callbacks.rb:598:in `block in invoke_before' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/callbacks.rb:598:in `each' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/callbacks.rb:598:in `invoke_before' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/callbacks.rb:119:in `block in run_callbacks' 09:47:11 web.1 | actiontext (7.1.3) lib/action_text/rendering.rb:23:in `with_renderer' 09:47:11 web.1 | actiontext (7.1.3) lib/action_text/engine.rb:69:in `block (4 levels) in <class:Engine>' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/callbacks.rb:130:in `instance_exec' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/callbacks.rb:130:in `block in run_callbacks' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/callbacks.rb:141:in `run_callbacks' 09:47:11 web.1 | actionpack (7.1.3) lib/abstract_controller/callbacks.rb:258:in `process_action' 09:47:11 web.1 | actionpack (7.1.3) lib/action_controller/metal/rescue.rb:25:in `process_action' 09:47:11 web.1 | actionpack (7.1.3) lib/action_controller/metal/instrumentation.rb:74:in `block in process_action' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/notifications.rb:206:in `block in instrument' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/notifications/instrumenter.rb:58:in `instrument' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/notifications.rb:206:in `instrument' 09:47:11 web.1 | actionpack (7.1.3) lib/action_controller/metal/instrumentation.rb:73:in `process_action' 09:47:11 web.1 | actionpack (7.1.3) lib/action_controller/metal/params_wrapper.rb:261:in `process_action' 09:47:11 web.1 | activerecord (7.1.3) lib/active_record/railties/controller_runtime.rb:32:in `process_action' 09:47:11 web.1 | actionpack (7.1.3) lib/abstract_controller/base.rb:160:in `process' 09:47:11 web.1 | actionview (7.1.3) lib/action_view/rendering.rb:40:in `process' 09:47:11 web.1 | actionpack (7.1.3) lib/action_controller/metal.rb:227:in `dispatch' 09:47:11 web.1 | actionpack (7.1.3) lib/action_controller/metal.rb:309:in `dispatch' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/routing/route_set.rb:49:in `dispatch' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/routing/route_set.rb:32:in `serve' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/journey/router.rb:51:in `block in serve' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/journey/router.rb:131:in `block in find_routes' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/journey/router.rb:124:in `each' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/journey/router.rb:124:in `find_routes' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/journey/router.rb:32:in `serve' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/routing/route_set.rb:882:in `call' 09:47:11 web.1 | warden (1.2.9) lib/warden/manager.rb:36:in `block in call' 09:47:11 web.1 | warden (1.2.9) lib/warden/manager.rb:34:in `catch' 09:47:11 web.1 | warden (1.2.9) lib/warden/manager.rb:34:in `call' 09:47:11 web.1 | rack (2.2.8) lib/rack/tempfile_reaper.rb:15:in `call' 09:47:11 web.1 | rack (2.2.8) lib/rack/etag.rb:27:in `call' 09:47:11 web.1 | rack (2.2.8) lib/rack/conditional_get.rb:27:in `call' 09:47:11 web.1 | rack (2.2.8) lib/rack/head.rb:12:in `call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/http/permissions_policy.rb:36:in `call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/http/content_security_policy.rb:33:in `call' 09:47:11 web.1 | rack (2.2.8) lib/rack/session/abstract/id.rb:266:in `context' 09:47:11 web.1 | rack (2.2.8) lib/rack/session/abstract/id.rb:260:in `call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/cookies.rb:689:in `call' 09:47:11 web.1 | activerecord (7.1.3) lib/active_record/migration.rb:655:in `call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/callbacks.rb:101:in `run_callbacks' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/callbacks.rb:28:in `call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/executor.rb:14:in `call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/actionable_exceptions.rb:16:in `call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/debug_exceptions.rb:29:in `call' 09:47:11 web.1 | web-console (4.2.0) lib/web_console/middleware.rb:132:in `call_app' 09:47:11 web.1 | web-console (4.2.0) lib/web_console/middleware.rb:28:in `block in call' 09:47:11 web.1 | web-console (4.2.0) lib/web_console/middleware.rb:17:in `catch' 09:47:11 web.1 | web-console (4.2.0) lib/web_console/middleware.rb:17:in `call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/show_exceptions.rb:31:in `call' 09:47:11 web.1 | railties (7.1.3) lib/rails/rack/logger.rb:37:in `call_app' 09:47:11 web.1 | railties (7.1.3) lib/rails/rack/logger.rb:24:in `block in call' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/tagged_logging.rb:135:in `block in tagged' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/tagged_logging.rb:39:in `tagged' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/tagged_logging.rb:135:in `tagged' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/broadcast_logger.rb:240:in `method_missing' 09:47:11 web.1 | railties (7.1.3) lib/rails/rack/logger.rb:24:in `call' 09:47:11 web.1 | sprockets-rails (3.4.2) lib/sprockets/rails/quiet_assets.rb:13:in `call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/remote_ip.rb:92:in `call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/request_id.rb:28:in `call' 09:47:11 web.1 | rack (2.2.8) lib/rack/method_override.rb:24:in `call' 09:47:11 web.1 | rack (2.2.8) lib/rack/runtime.rb:22:in `call' 09:47:11 web.1 | activesupport (7.1.3) lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/server_timing.rb:59:in `block in call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/server_timing.rb:24:in `collect_events' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/server_timing.rb:58:in `call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/executor.rb:14:in `call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/static.rb:25:in `call' 09:47:11 web.1 | rack (2.2.8) lib/rack/sendfile.rb:110:in `call' 09:47:11 web.1 | actionpack (7.1.3) lib/action_dispatch/middleware/host_authorization.rb:141:in `call' 09:47:11 web.1 | railties (7.1.3) lib/rails/engine.rb:536:in `call' 09:47:11 web.1 | puma (5.6.5) lib/puma/configuration.rb:252:in `call' 09:47:11 web.1 | puma (5.6.5) lib/puma/request.rb:77:in `block in handle_request' 09:47:11 web.1 | puma (5.6.5) lib/puma/thread_pool.rb:340:in `with_force_shutdown' 09:47:11 web.1 | puma (5.6.5) lib/puma/request.rb:76:in `handle_request' 09:47:11 web.1 | puma (5.6.5) lib/puma/server.rb:443:in `process_client' 09:47:11 web.1 | puma (5.6.5) lib/puma/thread_pool.rb:147:in `block in spawn_thread'