{"record":{"id":"e4b199d07db25bf0","repo":"oraios/serena","slug":"error-loading-serena-configuration-from-config-fi","errorCode":null,"errorMessage":"Error loading Serena configuration from {config_file_path}: {e}","messagePattern":"Error loading Serena configuration from (.+?): (.+?)","errorType":"exception","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"src/serena/config/serena_config.py","lineNumber":1045,"sourceCode":"    def from_config_file(cls, generate_if_missing: bool = True) -> \"SerenaConfig\":\n        \"\"\"\n        Static constructor to create SerenaConfig from the configuration file\n        \"\"\"\n        config_file_path = cls._determine_config_file_path()\n\n        # create the configuration file from the template if necessary\n        if not os.path.exists(config_file_path):\n            if not generate_if_missing:\n                raise FileNotFoundError(f\"Serena configuration file not found: {config_file_path}\")\n            log.info(f\"Serena configuration file not found at {config_file_path}, autogenerating...\")\n            cls._generate_config_file(config_file_path)\n\n        # load the configuration\n        log.info(f\"Loading Serena configuration from {config_file_path}\")\n        try:\n            loaded_commented_yaml = load_yaml(config_file_path)\n        except Exception as e:\n            raise ValueError(f\"Error loading Serena configuration from {config_file_path}: {e}\") from e\n\n        # create the configuration instance\n        instance = cls(_loaded_commented_yaml=loaded_commented_yaml, _config_file_path=config_file_path)\n        num_migrations = 0\n\n        def get_value_or_default(field_name: str) -> Any:\n            nonlocal num_migrations\n            if field_name not in loaded_commented_yaml:\n                num_migrations += 1\n            return loaded_commented_yaml.get(field_name, get_dataclass_default(SerenaConfig, field_name))\n\n        # transfer regular fields that do not require type conversion\n        for field_name in instance._iter_config_file_mapped_fields_without_type_conversion():\n            assert hasattr(instance, field_name)\n            setattr(instance, field_name, get_value_or_default(field_name))\n\n        # read projects\n        if \"projects\" not in loaded_commented_yaml:","sourceCodeStart":1027,"sourceCodeEnd":1063,"githubUrl":"https://github.com/oraios/serena/blob/7fcbca7e62555ec2287ddb2f083caee805848ea6/src/serena/config/serena_config.py#L1027-L1063","documentation":"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.","triggerScenarios":"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.","commonSituations":"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.","solutions":["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).","Validate the file with a YAML linter (e.g. `python -c \"import yaml; yaml.safe_load(open(path))\"`) before restarting Serena.","Restore the default config: back up the broken file and regenerate via from_config_file(generate_if_missing=True) after deleting it."],"exampleFix":"// before (serena_config.yml)\nprojects:\n\t- /repos/a   # tab indentation\n// after\nprojects:\n  - /repos/a","handlingStrategy":"validation","validationCode":"import yaml\ntry:\n    yaml.safe_load(open(config_path))\nexcept yaml.YAMLError as e:\n    print('invalid YAML:', e)  # fix before running Serena","typeGuard":"def is_valid_yaml(path) -> bool:\n    import yaml\n    try:\n        yaml.safe_load(open(path)); return True\n    except Exception:\n        return False","tryCatchPattern":"try:\n    config = SerenaConfig.from_config_file()\nexcept ValueError as e:\n    log.error('serena_config.yml is unparseable: %s', e)\n    restore_or_regenerate_config()","preventionTips":["Use spaces, never tabs, in YAML files","Run a YAML linter as a pre-commit hook on serena_config.yml","Avoid duplicate keys when merging config fragments"],"tags":["configuration","yaml","parsing","python"],"backgroundTag":"yaml-parse-error","analyzedSha":"7fcbca7e62555ec2287ddb2f083caee805848ea6","analyzedAt":"2026-08-29T00:04:09.619Z","schemaVersion":2},"datasetVersion":"2026-08-29T02:17:18.158Z"}