ErrLookup › astral-sh/ruff

astral-sh/ruff

An extremely fast Python linter and code formatter, written in Rust. · Rust · 2,845 source files

Analyzed at 672bb4edf0 on 2026-08-16. 86 documented errors.

Code / Message	Type	Severity	Tags
Failed to fetch playground ${id}: ${response.status}	exception	error	network, http, playground, typescript
Failed to save playground: ${response.status}	exception	error	network, http, playground, typescript
Failed to fetch playground ${id}: ${response.status}	exception	error	network, http, playground, typescript
Failed to save playground: ${response.status}	exception	error	network, http, playground, typescript
Unknown option: {key}	validation	error	cli, configuration, usage
The `--range` option is only supported when formatting a sin	validation	error	cli, formatter, usage
{flag} <reason> cannot contain newline characters	validation	error	cli, suppressions, validation
Unsupported serialization format for statistics: {:?}	validation	error	cli, output-format, statistics
Failed to convert path to URL: {}	exception	error	sarif, paths, output-format
Could not determine source kind for file: {}	exception	error	dev-tools, cli, python
Could not determine source kind for file: {}	exception	error	dev-tools, cli, python
Git fetch of commit {} failed: {}	exception	error	benchmark, git, network
Git checkout of commit {} failed: {}	exception	error	benchmark, git, cache
Git clone failed: {}	exception	error	benchmark, git, network
uv is not installed or not found in PATH. If you need to ins	exception	error	benchmark, dependencies, tooling
Failed to create virtual environment: {}	exception	error	benchmark, python, virtualenv
Dependency installation failed: {}	exception	error	benchmark, dependencies, network
The `{SECTION_CONFIG_SNAPSHOT}` directive does not take a va	validation	error	mdtest, testing, authoring
The `{SECTION_CONFIG_PULLTYPES}` directive does not take a v	validation	error
`-32603` uv was not found; is it installed and on the PATH?	error_code	error
`-32602` Invalid command `{name}`	validation	error
`-32601` Unknown request: {method}	error_code	error
`-32603` Request handler failed	panic	error
`-32602` No kind was given for code action	validation	error
`-32603` Cannot execute the '{}' command: the client does not support `workspace/applyEdi	error_code	error
client exited without proper shutdown sequence	console	error
Received exit notification before a shutdown request	console	error
Failed to send notification (method={method}): {error}	exception	error
Failed to send response for request {id}: {error}	exception	error
Failed to send response: {error}	exception	error
Text document URI does not point to a text document	exception	error
Tried to open unavailable document `{key}`	exception	error
Notebook document URI does not point to a notebook document	exception	error
Failed to convert workspace URI to file path: {workspace_uri	exception	error
Tried to remove non-existent workspace URI {workspace_uri}	exception	error
Tried to close unavailable document `{key}`	exception	error
tried to close document that didn't exist at {uri}	exception	error
Document controller not available at `{uri}`	exception	error
Invalid `cache-dir` value: {e}	validation	error
Invalid `extend` value: {e}	validation	error
Invalid `dummy-variable-rgx` value: {e}	validation	error
Rule `{prefix}{code}` was removed and cannot be selected.	validation	error
The following rules have been removed and cannot be selected	validation	error
Selection of deprecated rule `{prefix}{code}` is not allowed	validation	error
Selection of deprecated rules is not allowed when preview is	validation	error
Required import specified in `lint.isort.required-imports` (	validation	error
Required import `from collections.abc import Set` specified	validation	error
Required version `{required_version}` does not match the run	validation	error
Invalid alias for module '{module}': alias normalizes to '__	validation	error
`require-lazy` and `ban-lazy` must not overlap after applyin	validation	error
Expected at least one path to search for Python files	console	error	rust, ruff, file-discovery, empty-input, api-misuse
The current working directory `{}` contains non-Unicode char	console	error	ty, cli, unicode, paths, environment
Provided project path `{project}` is not a directory	console	error	ty, cli, configuration, paths, validation
`--watch` is not supported with uv workspace integration	console	error	ty, cli, uv, watch-mode, unsupported-feature
{e}	console	error	ty, cli, lint-rules, registry, validation
`uv sync` failed to run with exit code `{code}`, stderr: {st	console	error	rust, benchmark, uv, dependency-sync, environment
Detected project directory `{path}` contains non-Unicode cha	console	error	unicode, paths, benchmark, environment
could not find `pyproject.toml` in any ancestor of `{file}`	console	error	benchmark, project-discovery, pyproject, configuration
The current working directory `{}` contains non-Unicode char	console	error	unicode, paths, evaluation, environment
{truth} does not exist: ty's completion evaluation must be r	console	error	evaluation, paths, developer-tools, repo-root
Temporary directory path is not valid UTF-8: {}	console	error	unicode, tempfile, environment, evaluation
could not find task named `{}`	console	error	evaluation, cli, validation, fixtures
could not find any tasks matching the given criteria	console	error	evaluation, cli, validation, filters
found more than one task matching the given criteria	console	error	evaluation, cli, validation, filters
project directory `{project_path}` does not contain a base n	console	error	evaluation, paths, invariant, internal
truth source directory `{path}` contains invalid UTF-8	console	error	unicode, evaluation, paths, repo-hygiene
truth source directory `{dir}` does not contain a base name	console	error	evaluation, paths, invariant, internal
`uv sync` failed to run with exit code `{code}`, stderr: {st	console	error	evaluation, uv, dependency-sync, environment, network
path `{}` is not valid UTF-8	console	error	unicode, evaluation, paths, repo-hygiene
could not find any `<CURSOR>` directives in any of the files	validation	error	evaluation, fixtures, cursor-directives, authoring
{}	console	error	config, settings, pyproject, project-database, toml
`InvalidParams` Invalid command `{name}`	error_code	error	lsp, execute-command, invalid-params, commands
The current working directory `{}` contains non-Unicode char	console	error	server, startup, filesystem, unicode, encoding, cwd
Failed to get the current working directory while creating a	console	error	lsp, initialize, workspace, cwd, startup
`MethodNotFound` Unknown request: {method}	error_code	warning	lsp, method-not-found, routing, capabilities, version-mismatch
`InternalError` request handler {error}	error_code	error	lsp, internal-error, handler, panic, race-condition
`InvalidParams` JSON parsing failure: {json_err}	error_code	error	lsp, json, invalid-params, serialization, request
client exited without proper shutdown sequence	console	warning	lsp, shutdown, lifecycle, process, stdio
Received exit notification before a shutdown request	console	warning	lsp, shutdown, lifecycle, exit
Workspace URI is not a file path: {uri}	console	error	lsp, workspace, uri, did-change-workspace-folders
Workspace path is not valid UTF-8: {}	console	error	lsp, workspace, uri, unicode, encoding
Workspace not found: {uri}	console	warning	lsp, workspace, did-change-workspace-folders, state-mismatch
Workspace URI is not a file or directory: {uri:?}	console	error	lsp, workspace, uri, initialize
Workspace URI is not valid UTF8	console	error	lsp, workspace, uri, unicode, encoding
Text document path does not point to a text document	console	error	lsp, notebook, did-change, document-mismatch
Notebook document path does not point to a notebook document	console	error	lsp, notebook, did-change, document-mismatch