oraios/serena · error · ValueError

Error loading Serena configuration from {config_file_path}:

Error message

Error loading Serena configuration from {config_file_path}: {e}

What it means

SerenaConfig.from_config_file() wraps YAML parsing of serena_config.yml; any exception raised by load_yaml (malformed YAML, wrong types, IO errors) is re-raised as ValueError with the path and underlying message. It means the config file exists but could not be parsed.

Source

Thrown at src/serena/config/serena_config.py:1045

    def from_config_file(cls, generate_if_missing: bool = True) -> "SerenaConfig":
        """
        Static constructor to create SerenaConfig from the configuration file
        """
        config_file_path = cls._determine_config_file_path()

        # create the configuration file from the template if necessary
        if not os.path.exists(config_file_path):
            if not generate_if_missing:
                raise FileNotFoundError(f"Serena configuration file not found: {config_file_path}")
            log.info(f"Serena configuration file not found at {config_file_path}, autogenerating...")
            cls._generate_config_file(config_file_path)

        # load the configuration
        log.info(f"Loading Serena configuration from {config_file_path}")
        try:
            loaded_commented_yaml = load_yaml(config_file_path)
        except Exception as e:
            raise ValueError(f"Error loading Serena configuration from {config_file_path}: {e}") from e

        # create the configuration instance
        instance = cls(_loaded_commented_yaml=loaded_commented_yaml, _config_file_path=config_file_path)
        num_migrations = 0

        def get_value_or_default(field_name: str) -> Any:
            nonlocal num_migrations
            if field_name not in loaded_commented_yaml:
                num_migrations += 1
            return loaded_commented_yaml.get(field_name, get_dataclass_default(SerenaConfig, field_name))

        # transfer regular fields that do not require type conversion
        for field_name in instance._iter_config_file_mapped_fields_without_type_conversion():
            assert hasattr(instance, field_name)
            setattr(instance, field_name, get_value_or_default(field_name))

        # read projects
        if "projects" not in loaded_commented_yaml:

View on GitHub (pinned to 7fcbca7e62)

Solutions

1. Read the chained `from e` message to find the exact YAML parse error and line, then fix serena_config.yml syntax (spaces not tabs, valid indentation).
2. Validate the file with a YAML linter (e.g. `python -c "import yaml; yaml.safe_load(open(path))"`) before restarting Serena.
3. Restore the default config: back up the broken file and regenerate via from_config_file(generate_if_missing=True) after deleting it.

Example fix

// before (serena_config.yml)
projects:
	- /repos/a   # tab indentation
// after
projects:
  - /repos/a

import yaml
try:
    yaml.safe_load(open(config_path))
except yaml.YAMLError as e:
    print('invalid YAML:', e)  # fix before running Serena

def is_valid_yaml(path) -> bool:
    import yaml
    try:
        yaml.safe_load(open(path)); return True
    except Exception:
        return False

try:
    config = SerenaConfig.from_config_file()
except ValueError as e:
    log.error('serena_config.yml is unparseable: %s', e)
    restore_or_regenerate_config()

When it happens

Trigger: serena_config.yml contains invalid YAML syntax (bad indentation, tabs, duplicate keys, unquoted special characters) or is unreadable; load_yaml raises and from_config_file converts it to ValueError.

Common situations: Hand-editing the config and breaking indentation; merging config files causing duplicate keys; a comment-aware YAML loader choking on odd characters; partial writes from a crashed process leaving a truncated file.

Related errors

• Context file not found: {path.resolve()}
• Cannot use both fixed_tools and excluded_tools/included_opti
• Unknown language backend '{backend_str}': valid values are {
• Invalid line_ending: {value!r}. Valid values are: {valid}
• Cannot use interactive mode with asynchronous auto-generatio

AI-assisted analysis of oraios/serena@7fcbca7e62 (2026-08-29). Data as JSON: /api/errors/e4b199d07db25bf0. Report an issue: GitHub.