XTLS/Xray-core · error

Only one protobuf config file is allowed

Error message

Only one protobuf config file is allowed

What it means

Error "Only one protobuf config file is allowed" thrown in XTLS/Xray-core.

Source

Thrown at core/config.go:145

			if f == "" {
				return nil, errors.New("Failed to get format of ", file).AtWarning()
			}

			if f == "protobuf" {
				hasProtobuf = true
			}
			files[i] = &ConfigSource{
				Name:   file,
				Format: f,
			}
		}

		// only one protobuf config file is allowed
		if hasProtobuf {
			if len(v) == 1 {
				return configLoaderByName["protobuf"].Loader(v)
			} else {
				return nil, errors.New("Only one protobuf config file is allowed").AtWarning()
			}
		}

		// to avoid import cycle
		return ConfigBuilderForFiles(files)
	case io.Reader:
		if f, found := configLoaderByName[formatName]; found {
			return f.Loader(v)
		} else {
			return nil, errors.New("Unable to load config in", formatName).AtWarning()
		}
	}

	return nil, errors.New("Unable to load config").AtWarning()
}

func loadProtobufConfig(data []byte) (*Config, error) {
	config := new(Config)

View on GitHub (pinned to 7d214f8b09)

When it happens

Trigger: Thrown at core/config.go:145 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of XTLS/Xray-core@7d214f8b09 (2026-08-15). Data as JSON: /api/errors/ec1fad5068eb5be3. Report an issue: GitHub.