ErrLookup › langchain-ai/langchain
langchain-ai/langchain
The agent engineering platform. · Python · 1,740 source files
Analyzed at e32fa9a52e on 2026-08-14. 347 documented errors.
| Code / Message | Type | Severity | Tags |
|---|---|---|---|
| Unrecognized content block at messages | exception | error | messages, content-blocks, openai-conversion, unsupported-format, validation |
| NaN values found, please remove the NaN values and try again | exception | error | validation, numpy, cosine-similarity, nan, zero-vector, embeddings |
| {exc} | exception | error | ssrf, security, valueerror, network |
| numpy must be installed to use… | exception | error | dependencies, numpy, vectorstore, in-memory, mmr, optional-import |
| Remapping for fields starting with '_' or fields with a… | exception | error | pydantic, dynamic-model, field-names, reserved-names |
| Runnable doesn't have an inferable InputType. Override the… | exception | error | runnables, lcel, type-inference, typeerror, custom-components |
| Vectorstore has not implemented the adelete or delete method | exception | error | indexing, vector-store, not-implemented |
| jinja2 not installed, which is needed to use the… | exception | error | prompts, jinja2, importerror, dependencies, variable-inference |
| maximal_marginal_relevance requires numpy to be installed… | exception | error | dependencies, numpy, mmr, vectorstore, utils, optional-import |
| private IP range | exception | error | ssrf, security, network, private-ip |
| Expected version to be >= . Received . | exception | error | versioning, dependencies, environment |
| Invalid variable name | exception | error | prompts, f-string, template-validation, valueerror |
| jinja2 not installed, which is needed to use the… | exception | error | prompts, jinja2, importerror, dependencies, optional-deps |
| AsyncTextProjection received a non-string final value | exception | error | streaming, async, type-mismatch, chat-model |
| Runnable has no first node | exception | error | runnable, runnable-sequence, graph, get-graph, custom-runnable |
| Unrecognized content block at messages | exception | error | messages, content-blocks, bedrock, openai-conversion, validation |
| Expected a generator function type for `transform`.Instead… | exception | error | runnable, runnable-generator, streaming, typeerror |
| cosine_similarity requires numpy to be installed. Please… | exception | error | dependencies, numpy, cosine-similarity, vectorstore, utils, optional-import |
| Unexpected input | exception | error | prompts, chat, messages, validation, core |
| blocked CIDR | exception | error | ssrf, security, network, cidr |
| Invalid prompt schema; check for mismatched or missing… | exception | error | prompts, input-variables, template-validation, valueerror |
| Runnable doesn't have an inferable OutputType. Override the… | exception | error | output-parsers, typing, generics, serialization |
| Exactly one argument in each of the following groups must… | exception | error | api-contract, arguments, validation |
| search_type of not allowed. | exception | error | retriever, dispatch, subclassing |
| Got mismatched input_variables. Expected | exception | error | prompts, chat, validation, input-variables, core |
| Unknown BaseMessage type | exception | error | messages, openai, roles, custom-classes, type-coercion |
| Vectorstore does not have required method | exception | error | indexing, vector-store, interface |
| Unrecognized content block at messages | exception | error | messages, content-blocks, openai, anthropic, validation |
| Cannot invoke a coroutine function synchronously.Use… | exception | error | runnable, runnable-lambda, sync-async-mismatch, typeerror, asyncio |
| Invalid image template | exception | error | prompts, chat, multimodal, images, core |
| Expected a Pydantic model. Got | exception | error | pydantic, type-error, schema |
| Arguments 'observation' & 'llm_output' are required if… | exception | error | exceptions, output-parsing, agents, validation |
| Could not resolve content_key | exception | error | langsmith, document-loader, configuration, validation |
| RunnableSequence must have at least | exception | error | runnable, runnable-sequence, validation, constructor |
| Expected a Runnable, callable or dict.Instead got an… | exception | error | runnable, type-error, chain-composition, langchain-core |
| Unrecognized content block at messages | exception | error | messages, content-blocks, guard-content, validation |
| This output parser can only be used with a chat generation. | exception | error | output-parsers, openai, function-calling, legacy, chat-models |
| Unrecognized content block at messages | exception | error | messages, content-blocks, json, validation |
| Vectorstore should be either a VectorStore or a… | exception | error | indexing, type-error, vector-store |
| Invalid format | exception | error | tracing, langsmith, configuration, langchain-core |
| Unrecognized content block at messages | exception | error | messages, tool-calls, anthropic, openai-conversion, validation |
| cloud metadata endpoint | exception | critical | ssrf, security, cloud-metadata, credentials |
| Configuration key not found in : available keys are | exception | error | runnables, configuration, configurable-fields, valueerror, field-names |
| _type property is not implemented in class | exception | error | output-parsers, serialization, subclass-contract |
| localhost address | exception | error | ssrf, security, localhost, network |
| Number of columns in X and Y must be the same. X has shape | exception | error | validation, numpy, cosine-similarity, embeddings, dimension-mismatch, vectorstore |
| Unsupported version: . Expected 'v1', 'v2', or 'v3'. | exception | error | runnables, streaming, astream-events, notimplementederror, input-validation |
| module ' ' has no attribute | exception | error | imports, lazy-loading, langchain-core |
| Source IDs are required when cleanup mode is incremental or… | exception | error | indexing, cleanup, source-id, incremental |
| astream_events(version='v3') is only supported on Runnable… | exception | error | runnables, streaming, astream-events, notimplementederror, versioning |
| Could not parse function call | exception | error | output-parsers, openai, function-calling, legacy, llm-output |
| Unrecognized content block at messages | exception | error | messages, tool-calls, anthropic, openai-conversion, validation |
| Dict Pydantic schema unsupported with args_only | exception | error | openai-functions, pydantic, mutation, validation |
| Failed to hash metadata | exception | error | indexing, serialization, metadata, json |
| When tool includes an InjectedToolCallId argument, tool… | exception | error | tool, tool-calling, injected-tool-call-id, agents |
| Vectorstore has not implemented the delete method | exception | error | indexing, vector-store, delete, interface |
| ids must be the same length as texts. Got | exception | error | validation, vectorstore, in-memory, ids, add-documents |
| Unsupported Pydantic schema with args_only | exception | error | openai-functions, pydantic, type-mismatch |
| Expected version to be < . Received . | exception | error | versioning, dependencies, environment |
| jinja2 is unsafe and is not supported for templates… | exception | error | prompts, chat, jinja2, security, core |
| RunnableSequence contains conflicting config specsfor | exception | error | configurable-fields, runnable-sequence, lcel, config-conflict |
| Invalid template | exception | error | prompts, chat, validation, core |
| Recursion limit reached when invoking | exception | critical | runnable, runnable-lambda, recursion, infinite-loop, config |
| Unsupported template format | exception | error | prompts, template-format, valueerror, validation |
| stream_events(version='v3') is only supported on Runnable… | exception | error | runnables, streaming, stream-events, notimplementederror, sync-api |
| Class has a deprecated attribute . Please use the… | exception | error | serialization, migration, deprecated-api, serializable |
| Deserialization of is not allowed. The default… | exception | critical | security, deserialization, allowlist, load |
| Invalid json output | exception | error | output-parsers, json, llm-output, structured-output |
| Failed to generate JSON schema for | exception | error | |
| Network error while validating URL | exception | error | ssrf, dns, network, transient, validation |
| RunnableEach does not support astream_events yet. | exception | error | runnable, runnable-each, map, astream-events, not-implemented, tracing |
| invalid IP address | exception | error | ssrf, security, network, validation |
| Only one format variable allowed per image template.\nGot | exception | error | prompts, chat, multimodal, images, core |
| Expected '__openai_role__' to be a str, got | exception | error | messages, openai, system-role, type-error, validation |
| Partial variables are not supported for list of templates. | exception | error | prompts, chat, partial-variables, core |
| Must pass in a non-empty structured output schema. Received | exception | error | prompts, structured-output, pydantic, valueerror, missing-argument |
| Mustache templates cannot be validated. | exception | error | prompts, mustache, validation, valueerror |
| {response.text} | exception | error | http, api, rate-limit, provider |
| source_id_key should be either None, a string or a… | exception | error | indexing, validation, cleanup |
| SyncTextProjection received a non-string final value | exception | error | streaming, typeerror, internal-api |
| BooleanOutputParser expected output value to either be | exception | error | output-parsers, boolean, prompt-engineering, llm-output |
| Field must have a name to be deprecated. | exception | error | deprecation, pydantic-v1, langchain-core |
| Kubernetes internal DNS | exception | error | ssrf, security, kubernetes, dns |
| scheme ' ' not allowed | exception | error | ssrf, security, url-validation, scheme |
| Unsupported operand type for + | exception | error | prompts, prompt-template, notimplementederror, operator-overload, type-mismatch |
INVALID_PROMPT_INPUT Cannot have an input variable named 'stop', as it is used internally, please… | validation | error | prompts, validation, reserved-name, core |
| length must be >= 0, but got | exception | error | config, batch, value-error, internal-api, langchain-core |
| Received disallowed operator | exception | error | structured-query, self-query-retriever, vector-store, filter-translation |
| Found supplied twice. | exception | error | configuration, pydantic, chat-model |
| The delete operation to VectorStore failed. | exception | error | indexing, vector-store, cleanup, delete |
| _HashedDocument is an internal abstraction that was… | exception | error | indexing, deprecation, breaking-change, private-api |
| OpenAI messages can only support text and image data… | exception | error | messages, multimodal, vertexai, openai, unsupported-format |
| only supports async methods. | exception | error | runnable, runnable-generator, sync-async-mismatch, streaming |
| Source id key is required when cleanup mode is incremental… | exception | error | indexing, cleanup, source-id |
| Unsupported hashing algorithm | exception | error | indexing, hashing, validation |
| Expected version to be <= . Received . | exception | error | versioning, dependencies, environment |
| stream_events(version= ) is not supported. Use… | exception | error | runnables, streaming, stream-events, notimplementederror, async |
| Unable to convert blob | exception | error | blob, documents, not-implemented, file-like |
| Structured prompts need to be piped to a language model. | exception | error | prompts, structured-output, lcel, pipe-operator, notimplementederror |
| Received unsupported arguments | exception | error | structured-output, kwargs, input-validation |