ErrLookup › reflex-dev/reflex
reflex-dev/reflex
🕸️ Web apps in pure Python 🐍 · Python · 531 source files
Analyzed at 45b8ed5ab7 on 2026-08-28. 285 documented errors.
| Code / Message | Type | Severity | Tags |
|---|---|---|---|
| Unexpected keyword arguments | exception | error | reflex, computed-var, internal-api, typeerror, subclassing |
| Named props cannot be used with custom thresholds | exception | critical | app-harness, selenium, frontend, testing |
| react-router hmr runtime changed; unloaded-route HMR patch… | console | warning | hmr, vite, react-router, dev-server, version-mismatch |
| Cannot pass a Var to a built-in function. Consider using… | exception | error | reflex, var, frontend-state, typeerror |
| Could not find module | exception | error | reflex, module-not-found, config, rename, cli |
| Background task StateProxy is immutable outside of a… | exception | error | reflex, background-task, state-proxy, immutability, state-tree |
| Cannot use cached_property on a class without __set_name__. | exception | error | reflex, cached-property, descriptor, dynamic-class-creation, typeerror |
| Lock expired for token | exception | critical | reflex, redis, distributed-lock, timeout, concurrency |
| Deserialized state is not an instance of BaseState, cannot… | exception | error | reflex, state, pickle, disk-persistence, type-mismatch |
| Var-returning `@rx.memo | exception | error | reflex, rx-memo, typeerror, validation, components |
| f"Invalid . " + str(e) | validation | error | config, validation, reflex-hosting-cli |
| Expected _js_expr to be a string, got value | exception | error | reflex, var, typeerror, internal-api |
| Route part ` ` is not valid. Reflex only supports… | validation | error | reflex, routing, routes, validation, add-page |
| All parameters of ` ` must be annotated as `rx.Var[...]` or… | exception | error | reflex, rx-memo, typeerror, type-annotations, strict-mode |
| ComputedVar dependencies must be Var instances with a state… | exception | error | reflex, computed-var, dependencies, state, var-data |
| project search failed | http | error | http, hosting, api-error, reflex-cli, project-search |
| Cannot index into a primitive sequence with a Var. Consider… | exception | error | reflex, var, indexing, typeerror |
| prop value for of the ` ` component should be one of the… | exception | error | reflex, component-props, literal-validation, valueerror |
| LiteralVar subclasses must implement the json method. | exception | error | reflex, internal-api, subclassing, notimplementederror, json |
| Cannot directly call background task | exception | error | reflex, background-tasks, event-handlers, state, runtime-error |
| UntypedComputedVarError(var_name=fget.__name__) | exception | error | reflex, computed-var, type-annotation, state, typing |
| Cached var cannot access arbitrary state ` `, not found in… | exception | error | reflex, cached-var, dependency-tracking, import-error |
| {name} | exception | error | app-harness, selenium, driver-options, testing |
| The lock warning threshold | exception | error | reflex, redis, state-manager, config-validation, locking |
| LiteralVar subclasses must implement the _var_value… | exception | error | reflex, internal-api, subclassing, notimplementederror, vars |
| Cannot access a primitive map with a Var. Consider calling… | exception | error | reflex, vars, reactivity, dict-access |
| Event only provides arguments, but requires at least… | exception | error | reflex, event-handler, arity-mismatch, callback |
| Could not compare types | exception | error | reflex, type-checking, generics, event-handler |
| Could not interpret for as any of | exception | error | environment, union-type, validation, config |
| event_chain_kwargs are ignored for EventChainVar values. | console | warning | events, event-chain, kwargs-ignored, warning, python |
| Unknown mime type for | console | warning | image-serialization, mime-type, pillow, data-uri, warning |
| OTP field high-level wrapper requires a static integer… | validation | error | reflex, otp-field, component-create, static-analysis |
| detail | http | error | http, hosting, get-app, api-error, reflex-cli |
| The render function must take 2 arguments. | exception | error | reflex, foreach, render-function, arity |
| Please install pandas to use dataframes in your app. | exception | error | reflex, pandas, missing-dependency, importerror |
| Cannot assign the same cached_property to two different… | exception | error | reflex, cached-property, descriptor, metaprogramming, typeerror |
| Cannot suppress RuntimeError exceptions which may be raised… | exception | error | reflex, asyncio, task-suppression, runtimeerror, background-task |
| Memoized component modules | exception | error | reflex, memo-components, case-sensitivity, module-naming |
| `rx.EventHandler` parameters are only supported on… | exception | error | reflex, rx-memo, typeerror, event-handler, parameters |
| Invalid type for environment variable | exception | warning | environment, type-validation, internal, config |
| Var-returning `@rx.memo | exception | error | reflex, rx-memo, typeerror, imports, bundled-libraries |
| frontend_compression_formats contains unsupported format | exception | error | config, compression, validation, startup |
| The state is already mutable. Do not nest `async with self`… | exception | error | reflex, background-task, state-proxy, nested-context, deadlock-prevention |
| `children` in ` ` must be annotated as… | exception | error | reflex, rx-memo, typeerror, children, type-annotations |
| No requirements.txt found. | exception | error | deploy, requirements, dependencies, reflex-hosting-cli |
| Root state must be provided to convert legacy token to… | exception | warning | reflex, deprecation, token-migration, state |
| Compiled app root must be a Component. | exception | critical | reflex, compiler, app-wrap, internal-invariant |
| f"Expected EscapeSequence to have a single RawText child… | validation | error | reflex, docgen, markdown, parser, escape-sequence |
| Only should be provided, got , . | exception | error | reflex, templates, init, argument-validation |
| For ` ` template, `template_code_dir_name` and… | exception | error | reflex, templates, init, missing-argument |
| must implement get_component to return the component… | exception | error | reflex, component-state, not-implemented, subclass-contract |
| {iterable!s} | exception | error | reflex, foreach, type-annotation |
| Expected a Component, got | exception | error | reflex, component, render, typeerror |
| f"Match did not return a Var | validation | error | reflex, radix, icon-button, internal-invariant |
| Cannot pass a Var to a built-in function. Consider moving… | exception | error | reflex, var, builtin, typeerror |
| transformers should be a LiteralVar type. Got | exception | error | reflex, shiki, code-block, transformers, literal-var |
| To access rx.State in frontend components, at least one… | exception | error | reflex, state, compiler, runtime-error |
| Hybrid property ' ' of state ' ' accessed backend-only var… | exception | error | reflex, hybrid-property, backend-var, frontend |
| Color must be one of | validation | error | reflex, color, theming, validation |
| Expected one directory in the zip, found | exception | error | reflex, templates, zip, archive-layout |
| f"Icon name must be a string, got | validation | error | reflex, lucide, icon, type-error |
| Do not override _add_style directly. Use add_style instead. | exception | warning | reflex, component, style, api-misuse |
| Unsupported type for guess_type. | exception | error | reflex, var, type-annotation, typeerror |
| app_name should be a string | validation | error | validation, argument, hosting, reflex-cli, deploy |
| app_id should be a string | validation | error | validation, argument, hosting, reflex-cli |
| ` ` handler should have a parameter annotated as… | exception | error | upload, type-annotation, event-handler, validation |
| `children` in ` ` cannot be `rx.RestProp`. | exception | error | reflex, rx-memo, typeerror, children, rest-props |
| Failed to unzip the template | exception | error | reflex, templates, zip, badzipfile, download-corruption |
| Expected a Component or callable, got | exception | error | reflex, components, type-error, layout |
| File not found | exception | error | reflex, assets, shared-assets, package-files |
| Unsupported Operand type(s) for | exception | error | reflex, numbervar, type-error, arithmetic |
| Unexpected event type | exception | error | events, type-validation, event-handler |
| Failed to download the template | exception | error | reflex, templates, httpx, download, network, cli |
| The keys and values of the object must be literal vars to… | exception | error | reflex, literal-var, serialization, objectvar |
| _response_detail(ex.response, f"HTTP ") | exception | error | deployment, upload, hosting, http-status-error |
| At least one of `data` or `fp` must be provided. | exception | error | reflex, api-misuse, argument-validation, missing-data |
| f"No markdown component found for tag | validation | error | reflex, markdown, component-map, unknown-tag |
| Background task must use `async with self` to modify state. | exception | error | reflex, background-task, sync-vs-async, api-misuse |
| Missing value for environment variable | exception | error | environment, config, missing-value, dataclass |
| `@rx.memo` does not support `*args` in | exception | error | reflex, memo, signature, args, typeerror |
| `rx.Var[rx.Component]` parameters in | exception | error | reflex, rx-memo, typeerror, children, naming |
| the function names should be str names of functions in the… | exception | error | shiki, transformer, type-validation |
| f"Passing multiple children to Icon component is not… | validation | error | reflex, lucide, icon, too-many-children |
| Cannot find package associated with import | exception | error | reflex, cached-var, relative-import, dependency-tracking |
| `@rx.memo` only supports one `rx.RestProp` in | exception | error | reflex, rx-memo, typeerror, rest-props, parameters |
| All parameters of ` ` must be annotated as `rx.Var[...]` or… | exception | error | reflex, memo, annotation, typing, typeerror |
| @rx.event(background=True) is not supported for upload… | exception | error | upload, event-handler, background-task, validation |
| `children` in ` ` cannot be an `rx.EventHandler`; use… | exception | error | reflex, rx-memo, typeerror, children, event-handler |
| Only one of `data` or `fp` may be provided, not both. | exception | error | reflex, api-misuse, argument-validation, pickle |
| `rx.EventHandler` parameter | exception | error | reflex, rx-memo, typeerror, event-handler, default-value |
| Var of type does not support item access. | exception | error | reflex, var, item-access, type-annotation |
| Cannot specify different ports for frontend and backend… | console | error | reflex, cli, ports, single-port, configuration |
| HybridProperty has no getter function | exception | error | reflex, hybrid-property, attribute-error, missing-getter |
| Failed to create temp directory for download | exception | error | reflex, templates, tempdir, permissions, disk-full |
| The State var ` ` of type has no attribute ' ' or may have… | exception | error | reflex, objectvar, annotation, attribute-error |
| Cannot use --single-port with --frontend-only or… | console | error | reflex, cli, flags, single-port, argument-validation |
| Upload handler returned before consuming all upload chunks. | exception | error | upload, task-lifecycle, streaming |
| Could not foreach over var | exception | error | reflex, foreach, type-annotation |
| Context is already attached, cannot enter context manager. | exception | error | context-manager, runtime, state, async |
| For cases with return types as Vars, a default case must be… | validation | error | reflex, match, missing-default |